GRASS-Wiki - User contributions [en]

GRASS 6 Terminology

2016-01-31T15:25:14Z

⚠️Dmci:

== General ==

* '''DATABASE''': This is the unix directory containing the geographic LOCATIONS (also called GIS'''D'''BASE). For a desktop GIS user typically this will be a subdirectory called <tt>grassdata</tt> in your home directory.

* '''LOCATION''': This is the name of an available geographic location. It contains a series of MAPSETS which share a common map projection.
: Typically its name will be based on the larger job/project you are working on, a reflection of the map projection which it will use, or a combination of both of these. For example: "''The_Rockies''", "''UTM18_nad27''", "''LL_wgs84''", "''Spearfish60''", "''simple_xy''".

* '''MAPSET''': Every GRASS session runs under the name of a MAPSET. A MAPSET may be a geographical subset or as large as the parent LOCATION. Technically they are subdirectories under any location. In a networked environment with several users working within the same location, mapsets play a special role. Users may only select (and thus modify) a mapset that they own (i.e., have created). However, data in all mapsets for a given location can be read by anyone (unless prevented by UNIX file permissions). The "PERMANENT" mapset usually contains the read-only base maps like the elevation model, while the other locations are readable and writable by their owners. The "PERMANENT" mapset also contains some information about the location itself that is not found in the mapsets (projection info etc.), thus it must exist in every location.
: The MAPSETS might be named for their owner (on a networked multi-user system) (''e.g. user1''), a specific area or study site within the greater region (''e.g. Wade_County''), all maps concerning a specific field study (''e.g. Jan2008''), or whatever is useful to organize your data.

[[File:Loc_struct.png|center|thumb|600px|Structure of the GRASS data hierarchy]]

* '''REGION''': The REGION may be the entire area or subset of the chosen LOCATION. It is defined by northern, southern, eastern, and western bounds, as well as the raster grid resolution. It is controlled by the {{cmd|g.region}} module and is of primary importance for raster operations. Its most obvious effect is of setting the map zoom, but it is much more than that.

* '''WINDOW''': see REGION



== Raster map precision ==

* '''CELL DATA TYPE''': a raster map from INTEGER type (whole numbers only)
* '''FCELL DATA TYPE''': a raster map from FLOAT type (4 bytes, 7-9 digits precision)
* '''DCELL DATA TYPE''': a raster map from DOUBLE type (8 bytes, 15-17 digits precision)
* '''NULL''': represents "no data" in raster maps, to be distinguished from 0 (zero) data value

* '''INTEGER MAP''': see CELL DATA TYPE
* '''FLOAT MAP''': see FCELL DATA TYPE
* '''DOUBLE MAP''': see DCELL DATA TYPE

== Raster 3D maps ==

* '''VOXEL''': Volumetric Pixel -- a 3-dimensional grid cell. (An individual cube in a greater 3D region block)

== Vector maps ==

* '''CATEGORY NUMBER''': A numerical value for a map feature (e.g. road number). The CATEGORY NUMBER is related to the attribute database. The internal vector feature ID is different from this.

* '''LAYER''': A single vector map can be connected to multiple database tables. This number determines which table to use.

* '''DRIVER''': The database backend. e.g. dbf, sqlite, pg, mysql

* '''TABLE''': The attribute table(s) associated with a map.

* '''DATABASE''': The path or connection to the backend database storage.

* '''KEY COLUMN''': The attribute column that relates the spatial data to the attribute database data. Typically the <tt>cat</tt> column is used as the key column.

* '''SQL''': The Structured Query Language. A standardized method of accessing and manipulating databases. Almost all modern databases speak some dialect of this common language.

== Map Projections ==

''See the [[GIS Concepts]] wiki page for details.


see the [[GRASS 7 Terminology]] page for more discussion.

[[Category: Documentation]]
[[Category: FAQ]]

GRASS 6 Terminology

2016-01-31T15:24:55Z

⚠️Dmci: reorder database --> location --> mapset for consistency with image

WCS

2014-01-08T14:33:10Z

⚠️Dmci: added some WCS endpoints and info about EuroGEOSS brokder

__TOC__

This page OGC Web Coverage Services (WCS) support in GRASS GIS.

== Metasites and collections of WCS servers ==

* [http://184.73.174.89/gi-cat-StP/services/cswisogeo?service=CSW&request=GetRecordById&id=urn:geoss:csr:resource:urn:uuid:b4ff75f1-28de-37ff-086a-52cff996df5e&outputschema=http://www.isotc211.org/2005/gmi&elementSetName=full US Daily NDVI WCS 2011]
* [http://184.73.174.89/gi-cat-StP/services/cswisogeo?service=CSW&request=GetRecordById&id=urn:geoss:csr:resource:urn:uuid:d00fdccf-a1b3-431e-9d94-b0afbcf038a3&outputschema=http://www.isotc211.org/2005/gmi&elementSetName=full Global Drought WCS]
* More WCS endpoints can be obtained by searching the [http://www.eurogeoss-broker.eu/ EuroGEOSS Broker] and by specifying ''Web Coverage Service'' in the Keyword section.

== Using WCS in GRASS GIS ==

One option is to register the WCS service via {{cmd|r.external|version=70}}.

First create ASCII file with this content, named e.g. "wcs_geoserver_LL.wcs":

<source lang="xml">
<WCS_GDAL>
<ServiceURL>http://demo.opengeo.org/geoserver/wcs?</ServiceURL>
<CoverageName>Img_Sample</CoverageName>
</WCS_GDAL>
</source>

or simply download this file from [http://svn.osgeo.org/gdal/trunk/autotest/gdrivers/data/geoserver.wcs here].

Start GRASS in a latlong location (EPSG 4326), then register the WCS file:

<source lang="bash">
r.external input=wcs_geoserver_LL.wcs output=wcs_data
</source>

Then you can look at the map in the wxGUI map display:

[[Image:WCS import with r external.png|thumb|center|400px|Import of WCS via r.external, display with RGB viewer]]

In order to limit the WCS to a bounding box (e.g. from current region) a GDAL vrt file can be created from the WCS ASCII file using gdalbuildvrt:
<source lang="bash">
gdalbuildvrt wcs_geoserver_LL_BB.vrt wcs_geoserver_LL.wcs -te xmin ymin xmax ymax
</source>

== See also ==

* [http://www.gdal.org/frmt_wcs.html WCS_GDAL - OGC Web Coverage Service support]

[[Category: Documentation]]
[[Category: FAQ]]
[[Category: Geodata]]
[[Category: OGC]]
[[Category: Raster]]

GRASS Metadata Management

2013-08-06T12:34:32Z

⚠️Dmci: /* Creating an INSPIRE compliant version of {v,r}.support */

== Metadata support ==

=== Raster ===
* {{cmd|r.support}} (r.support history="long text" now functional, it does line wrapping)
* [[Replacement raster format#Meta-data support|Metadata support in GRASS raster library notes]]

=== Vector ===
* [http://download.osgeo.org/grass/grass6_progman/Vector_Library.html#head_file_format 'head' file format]
* TODO: tool to edit this head file needed using {{cmd|v.support}}. (Reference: http://lists.osgeo.org/pipermail/grass-user/2007-February/038378.html)

Comments on a vector map can be added manually by editing <code>$MAPSET/vector/$MAPNAME/hist</code>.

== Metadata management ideas for future versions of GRASS ==

=== Unified XML-based approach for raster/vector/imagery ===
* store relevant metadata in an XML-based format, along with creation/modification history
* a new directory '$maspset/metadata/' could house this information
* would probably require major re-write of the raster/vector history mechanism
* generic reading/writing of XML data (don't we already have this functionality somewhere...)

=== Creating an INSPIRE compliant version of {v,r}.support ===

One idea would be to develop an INSPIRE compliant version of {v,r}.support. The module would ensure that all fields required for INSPIRE would be completed. It should be possible to write the Metadata out as XML (see above section). The European Union Open Source Metadata Editor (EUOSME) is a Web-based INSPIRE module that is published under the European Union Public Licence [1,2].

[1] [http://inspire-forum.jrc.ec.europa.eu/pg/pages/view/34267/ EUOSME]

[2] [http://www.eurogeoss.eu/Documents/EuroGEOSS_D_2_2_3.pdf Required Fields]

== Links ==
* [http://www.eurogeographics.org/eng/documents/draftINSPIREMetadataIRv2_20070202.pdf DT Metadata – Draft Implementing Rules for Metadata]
* http://wiki.osgeo.org/wiki/Metadata and http://wiki.osgeo.org/wiki/Metadata_software (software list)
* http://www.gsdi.org/gsdicookbookindex.php
* http://inspire.jrc.ec.europa.eu/reports/ImplementingRules/metadata/MD_IR_and_ISO_20090218.pdf
* https://www.ngdc.noaa.gov/wiki/index.php?title=ISO_Metadata_Standard

[[Category:Development]]

GRASS Metadata Management

2013-08-06T12:34:15Z

⚠️Dmci: /* Creating an INSPIRE compliant version of {v,r}.support */

== Metadata support ==

=== Raster ===
* {{cmd|r.support}} (r.support history="long text" now functional, it does line wrapping)
* [[Replacement raster format#Meta-data support|Metadata support in GRASS raster library notes]]

=== Vector ===
* [http://download.osgeo.org/grass/grass6_progman/Vector_Library.html#head_file_format 'head' file format]
* TODO: tool to edit this head file needed using {{cmd|v.support}}. (Reference: http://lists.osgeo.org/pipermail/grass-user/2007-February/038378.html)

Comments on a vector map can be added manually by editing <code>$MAPSET/vector/$MAPNAME/hist</code>.

== Metadata management ideas for future versions of GRASS ==

=== Unified XML-based approach for raster/vector/imagery ===
* store relevant metadata in an XML-based format, along with creation/modification history
* a new directory '$maspset/metadata/' could house this information
* would probably require major re-write of the raster/vector history mechanism
* generic reading/writing of XML data (don't we already have this functionality somewhere...)

=== Creating an INSPIRE compliant version of {v,r}.support ===

One idea would be to develop an INSPIRE compliant version of {v,r}.support. The module would ensure that all fields required for INSPIRE would be completed. It should be possible to write the Metadata out as XML (see above section). The European Union Open Source Metadata Editor (EUOSME) is a Web-based INSPIRE module that is published under the European Union Public Licence [1].

[1] [http://inspire-forum.jrc.ec.europa.eu/pg/pages/view/34267/ EUOSME]
[2] [http://www.eurogeoss.eu/Documents/EuroGEOSS_D_2_2_3.pdf Required Fields]

== Links ==
* [http://www.eurogeographics.org/eng/documents/draftINSPIREMetadataIRv2_20070202.pdf DT Metadata – Draft Implementing Rules for Metadata]
* http://wiki.osgeo.org/wiki/Metadata and http://wiki.osgeo.org/wiki/Metadata_software (software list)
* http://www.gsdi.org/gsdicookbookindex.php
* http://inspire.jrc.ec.europa.eu/reports/ImplementingRules/metadata/MD_IR_and_ISO_20090218.pdf
* https://www.ngdc.noaa.gov/wiki/index.php?title=ISO_Metadata_Standard

[[Category:Development]]

GRASS Metadata Management

2013-08-06T12:31:53Z

⚠️Dmci: /* Added section on EUOSME */

== Metadata support ==

=== Raster ===
* {{cmd|r.support}} (r.support history="long text" now functional, it does line wrapping)
* [[Replacement raster format#Meta-data support|Metadata support in GRASS raster library notes]]

=== Vector ===
* [http://download.osgeo.org/grass/grass6_progman/Vector_Library.html#head_file_format 'head' file format]
* TODO: tool to edit this head file needed using {{cmd|v.support}}. (Reference: http://lists.osgeo.org/pipermail/grass-user/2007-February/038378.html)

Comments on a vector map can be added manually by editing <code>$MAPSET/vector/$MAPNAME/hist</code>.

== Metadata management ideas for future versions of GRASS ==

=== Unified XML-based approach for raster/vector/imagery ===
* store relevant metadata in an XML-based format, along with creation/modification history
* a new directory '$maspset/metadata/' could house this information
* would probably require major re-write of the raster/vector history mechanism
* generic reading/writing of XML data (don't we already have this functionality somewhere...)

=== Creating an INSPIRE compliant version of {v,r}.support ===

One idea would be to develop an INSPIRE compliant version of {v,r}.support. The module would ensure that all fields required for INSPIRE would be completed. It should be possible to write the Metadata out as XML (see above section). The European Union Open Source Metadata Editor (EUOSME) is a Web-based INSPIRE module that is published under the European Union Public Licence [1].

[1] [http://inspire-forum.jrc.ec.europa.eu/pg/pages/view/34267/ EUOSME]

== Links ==
* [http://www.eurogeographics.org/eng/documents/draftINSPIREMetadataIRv2_20070202.pdf DT Metadata – Draft Implementing Rules for Metadata]
* http://wiki.osgeo.org/wiki/Metadata and http://wiki.osgeo.org/wiki/Metadata_software (software list)
* http://www.gsdi.org/gsdicookbookindex.php
* http://inspire.jrc.ec.europa.eu/reports/ImplementingRules/metadata/MD_IR_and_ISO_20090218.pdf
* https://www.ngdc.noaa.gov/wiki/index.php?title=ISO_Metadata_Standard

[[Category:Development]]

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:40:10Z

⚠️Dmci: /* Displaying vector data from the CLI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: one approach uses the CLI and the <code>d.mon</code> display monitors, while the other shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

===Displaying raster data from the CLI===

In some situations, you might find the CLI a quick alternative to display your vector data. You need to start a display monitor as follows:

d.mon start=x0

Depending on your region settings, you may want to set the region to the full extent of your raster map:
g.region rast=elevation

Then you simply launch the <code>d.rast</code> command to display the map.
d.rast elevation

[[File:D_rast_elevation.png|center|300px]]

To have more control over the display settings for the raster, check the additional options by <code>d.rast --help</code>. You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

If you want to retrieve the pixel values at a certain x,y location, you should use the <code>d.what.rast</code> command, which will change the pointer in the display window to a cross-hair. With the mouse, you click on the location(s) of interest and the raster values are printed in the terminal window. The module <code>d.where</code>, which prints the geographic (x,y) location of the cursor, works in a similar way.

[[File:D_what_rast.png|center|300px]]

===Displaying vector data from the CLI===
We can display vector data very easily in the display monitors using the module [http://grass.osgeo.org/grass65/manuals/d.vect.html <code>d.vect</code>]. To quickly display a vector we:

d.mon start=x0 ''(if you don't have a monitor open)''
g.region vect=geology
d.vect geology type=area

[[File:D_vect.png|center|300px]]

We can return the attributes assigned to features, using <code>d.what.vect</code> and clicking on the relevant features in the display window:
[[File:D_what_vect.png|center|300px]]

===Plotting an elevation profile===
Plotting an elevation profile between two points is done by running <code>d.profile</code>. Click the
middle mouse button to define the start of the line profile and click it again to identify the end of
the line.

[[File:D_profile.png|center|300px]]

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:39:52Z

⚠️Dmci: /* Displaying vector data from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:39:06Z

⚠️Dmci: /* Displaying raster data from the CLI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: one approach uses the CLI and the <code>d.mon</code> display monitors, while the other shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

===Displaying raster data from the CLI===

In some situations, you might find the CLI a quick alternative to display your vector data. You need to start a display monitor as follows:

d.mon start=x0

Depending on your region settings, you may want to set the region to the full extent of your raster map:
g.region rast=elevation

Then you simply launch the <code>d.rast</code> command to display the map.
d.rast elevation

[[File:D_rast_elevation.png|center|300px]]

To have more control over the display settings for the raster, check the additional options by <code>d.rast --help</code>. You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

If you want to retrieve the pixel values at a certain x,y location, you should use the <code>d.what.rast</code> command, which will change the pointer in the display window to a cross-hair. With the mouse, you click on the location(s) of interest and the raster values are printed in the terminal window. The module <code>d.where</code>, which prints the geographic (x,y) location of the cursor, works in a similar way.

[[File:D_what_rast.png|center|300px]]

===Displaying vector data from the CLI===
We can display vector data very easily in the display monitors using the module [http://grass.osgeo.org/grass65/manuals/d.vect.html <code>d.vect</code>]. To quickly display a vector we:

d.vect geology type=area

[[File:D_vect.png|center|300px]]

We can return the attributes assigned to features, using <code>d.what.vect</code> and clicking on the relevant features in the display window:
[[File:D_what_vect.png|center|300px]]

===Plotting an elevation profile===
Plotting an elevation profile between two points is done by running <code>d.profile</code>. Click the
middle mouse button to define the start of the line profile and click it again to identify the end of
the line.

[[File:D_profile.png|center|300px]]

File:D vect.png

2013-08-05T21:38:50Z

⚠️Dmci:

File:D what vect.png

2013-08-05T21:38:26Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:22:36Z

⚠️Dmci: /* Displaying raster data from the CLI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: one approach uses the CLI and the <code>d.mon</code> display monitors, while the other shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

===Displaying raster data from the CLI===

In some situations, you might find the CLI a quick alternative to display your vector data. You need to start a display monitor as follows:

d.mon start=x0

Depending on your region settings, you may want to set the region to the full extent of your raster map:
g.region rast=elevation

Then you simply launch the <code>d.rast</code> command to display the map.
d.rast elevation

[[File:D_rast_elevation.png|center|300px]]

To have more control over the display settings for the raster, check the additional options by <code>d.rast --help</code>. You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

If you want to retrieve the pixel values at a certain x,y location, you should use the <code>d.what.rast</code> command, which will change the pointer in the display window to a cross-hair. With the mouse, you click on the location(s) of interest and the raster values are printed in the terminal window. The module <code>d.where</code>, which prints the geographic (x,y) location of the cursor, works in a similar way.

[[File:D_what_rast.png|center|300px]]

===Plotting an elevation profile===
Plotting an elevation profile between two points is done by running <code>d.profile</code>. Click the
middle mouse button to define the start of the line profile and click it again to identify the end of
the line.

[[File:D_profile.png|center|300px]]

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:21:14Z

⚠️Dmci: /* Plotting an elevation profile */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: one approach uses the CLI and the <code>d.mon</code> display monitors, while the other shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

===Displaying raster data from the CLI===

In some situations, you might find the CLI a quick alternative to display your vector data. You need to start a display monitor as follows:

d.mon start=x0

Depending on your region settings, you may want to set the region to the full extent of your raster map:
g.region rast=elevation

Then you simply launch the <code>d.rast</code> command to display the map.
d.rast elevation

[[File:D_rast_elevation.png|center|300px]]

To have more control over the display settings for the raster, check the additional options by <code>d.rast --help</code>. You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

If you want to retrieve the pixel values at a certain x,y location, you should use the <code>d.what.rast</code> command, which will change the pointer in the display window to a cross-hair. With the mouse, you click on the location(s) of interest and the raster values are printed in the terminal window.

[[File:D_what_rast.png|center|300px]]

===Plotting an elevation profile===
Plotting an elevation profile between two points is done by running <code>d.profile</code>. Click the
middle mouse button to define the start of the line profile and click it again to identify the end of
the line.

[[File:D_profile.png|center|300px]]

File:D profile.png

2013-08-05T21:20:08Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:18:57Z

⚠️Dmci: /* Displaying raster data from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-08-05T21:18:25Z

⚠️Dmci:

File:D rast elevation.png

2013-08-05T21:17:34Z

⚠️Dmci: Dmci uploaded a new version of "File:D rast elevation.png"

File:D what rast.png

2013-08-05T21:17:02Z

⚠️Dmci:

File:D rast elevation.png

2013-08-05T21:16:36Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:59:54Z

⚠️Dmci: /* Displaying raster data from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:46:48Z

⚠️Dmci: /* Displaying raster data from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:42:41Z

⚠️Dmci: /* Displaying raster data from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:42:16Z

⚠️Dmci: /* Displaying raster data from the CLI */

File:Dmon elevation.png

2013-07-31T21:41:25Z

⚠️Dmci:

File:Dwhatrast.png

2013-07-31T21:40:34Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:40:07Z

⚠️Dmci: /* Displaying from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T21:09:28Z

⚠️Dmci: /* Displaying from the CLI */

GRASS 6 Tutorial/Displaying spatial data

2013-07-31T12:01:28Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-07-30T21:45:14Z

⚠️Dmci: /* Displaying from the CLI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: the first uses the CLI and the <code>d.mon</code> display monitors, while the second shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===Displaying from the CLI===

d.mon start=x0
g.region rast=elevation
d.rast elevation

You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

Plotting an elevation profile between two points is done by running <code>d.profile</code>:

[[File:Dprofile-elevation.png|center|300px]]

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

File:Dprofile-elevation.png

2013-07-30T21:22:31Z

⚠️Dmci: Dmci uploaded a new version of "File:Dprofile-elevation.png"

File:Dprofile-elevation.png

2013-07-30T21:20:50Z

⚠️Dmci:

GRASS 6 Tutorial/Displaying spatial data

2013-07-30T21:17:42Z

⚠️Dmci: /* Displaying from the CLI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We focus on two approaches: the first uses the CLI and the <code>d.mon</code> display monitors, while the second shows you how to use the GRASS wxGUI. This reader is redirected to the Quick wxGUI tutorial for more information on this topic.

===Displaying from the CLI===

d.mon start=x0
g.region rast=elevation
d.rast elevation

You can navigate within the display monitor using a combination of <code>d.pan</code> and <code>d.zoom</code> in conjunction with the mouse buttons.

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

GRASS 6 Tutorial/Displaying spatial data

2013-07-30T21:16:30Z

⚠️Dmci: /* Displaying spatial data with GRASS */

GRASS 6 Tutorial/Displaying spatial data

2013-07-30T21:14:51Z

⚠️Dmci: /* Displaying from the GUI */

==Displaying spatial data with GRASS==

This section of the tutorial explains how to display raster and vector data using GRASS GIS. We split it into two sections: the first uses the CLI and the <code>d.mon</code> display monitors, while the second shows you how to use the GRASS wxGUI.

===Displaying from the CLI===

===[http://grasswiki.osgeo.org/wiki/Quick_wxGUI_tutorial#Displaying_maps Displaying from the wxGUI]===

GRASS 6 Tutorial/Displaying spatial data

2013-07-30T08:33:03Z

⚠️Dmci: Created page with "==Displaying spatial data with GRASS== This section of the tutorial explains how to display raster and vector data using GRASS GIS. We split it into two sections: the first u..."

GRASS 6 Tutorial

2013-07-30T08:29:58Z

⚠️Dmci: /* Examples from US National Atlas [from GRASS 5.7 tutorial] */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Using GRASS with raster data==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Using GRASS with vector data==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===[http://grass.osgeo.org/grass57/tutorial/ex_complex.html Complex usage examples [from GRASS 5.7 tutorial]]===

===[http://grass.osgeo.org/grass57/tutorial/usa_demo.html Examples from US National Atlas [from GRASS 5.7 tutorial]]===

==Using GRASS with R==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

==Using GRASS with GMT==

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:29:20Z

⚠️Dmci: /* Complex usage examples [from GRASS 5.7 tutorial] */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Using GRASS with raster data==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Using GRASS with vector data==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===[http://grass.osgeo.org/grass57/tutorial/ex_complex.html Complex usage examples [from GRASS 5.7 tutorial]]===

===Examples from US National Atlas [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Using GRASS with R==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

==Using GRASS with GMT==

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:27:26Z

⚠️Dmci: /* Vector data management */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Using GRASS with raster data==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Using GRASS with vector data==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Using GRASS with R==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

==Using GRASS with GMT==

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:26:56Z

⚠️Dmci: /* Raster data management */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Using GRASS with raster data==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Vector data management==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Using GRASS with R==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

==Using GRASS with GMT==

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:25:48Z

⚠️Dmci:

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Raster data management==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Vector data management==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Using GRASS with R==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

==Using GRASS with GMT==

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:23:40Z

⚠️Dmci: /* Vector Import and Usage examples FROM GRASS 5.7 tutorial */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Raster data management==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Vector data management==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

===Vector network analysis examples [from GRASS 5.7 tutorial]===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas [from GRASS 5.7 tutorial]===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

===Links of interest===

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Further reading==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:21:58Z

⚠️Dmci: /* Introduction */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Displaying_spatial_data Displaying Spatial Data]===

==Raster data management==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Vector data management==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

==Vector Import and Usage examples FROM GRASS 5.7 tutorial==

'''Below are from the GRASS-5.7 Tutorial -- but are being updated and merged into GRASS-6...'''

===Vector network analysis examples===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

===Links of interest===

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Further reading==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial

2013-07-30T08:20:52Z

⚠️Dmci: /* Introduction */

GRASS GIS version 6.4 is fully operational and stable version that can be used for production use. This tutorial will familiarize you with the improved functionality and will focus on raster and vector data management as well some basic spatial data analysis.

This tutorial is intended for GRASS GIS users who want to migrate from a previous release to the new GRASS Version. If you are a beginner, please also consider additional [http://grass.itc.it/gdp/tutorials.php books or tutorials] as well as consulting the [[GRASS_Help| Introductory Material]].

'''Disclaimer:''' In case the examples described here do not work properly, you are kindly invited to send us further examples and/or code bugfixes/enhancements. Enjoy the WIKI!

'''''NOTE: This tutorial is under construction and is incorporating sections of the [http://grass.osgeo.org/grass57/tutorial/ previous GRASS 5.7 tutorial].'''''

==Introduction==

New developments in GRASS GIS have made major improvements to the vector
architecture. The most significant change includes a new 2- and
3-dimensional vector library that manages vector attributes in
standard database management systems (DBMS), providing a fully relational database for vector attribute management,
while preserving the flexibility of traditional GRASS topological
tools. GRASS now also incorporates true 3-dimensional voxels in the
[http://grass.itc.it/gdp/nviz/index.html NVIZ] visualization environment as well as [http://grass.itc.it/grass60/index.php numerous enhancements] to
virtually every tool in the GRASS library.

If you are new to GRASS GIS and plan to use the command line inteface and/or within a Linux environment, it is recommended that you read the [http://www.linux.org/lessons/ Introductory Material] for Linux. Also, if you have been using other GIS packages, you may find the [[GRASS_Help#Migration_from_other_GIS_Software|Migration tips]] useful reading.

This tutorial is designed to give you hands-on experience with GRASS GIS. We start by showing you how to view and query raster and vector data and continue by explaining how to import and process raster and vector data.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Getting_Started Getting started]===

==Raster data management==

===Overview===

This section of the tutorial is intended to provide new users with an introduction to raster data management in GRASS GIS. As with other parts of the GRASS 6 tutorial, the examples are largely based on the GRASS 5.7 tutorial as well as the GRASS GIS presentation at Geostat-2012. The aim is to present the reader with introductory information on handling raster data within GRASS GIS. It is worth mentioning that the raster management hasn't changed significantly from previous versions of GRASS (e.g. versions 4 or 5), therefore older tutorials and books on the GRASS raster modules should also work.

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Raster_data_management Raster Data Management]===

==Vector data management==

===Overview===
The native GRASS vector format provides provides vector topology with n:m mapping of geometry features to attributes. In addition, vector layers are supported with a variety of database management systems (DBMS) supported as back-ends that include: SQLite, PostgreSQL + PostGIS, MySQL, ODBC (, DBF). The vector geometry types supported in GRASS includes: points, centroids, lines, boundaries, areas (boundaries + centroids), face (3d areas), kernels and volumes.

The examples that follow in this section on vector data management are based on the datasets available [http://data.neteler.org/geostat2012/north_carolina here]

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_data_management Vector Data Management]===

===[http://grasswiki.osgeo.org/wiki/GRASS_6_Tutorial/Vector_spatial_analysis Vector Spatial Analysis]===

==Vector Import and Usage examples FROM GRASS 5.7 tutorial==

'''Below are from the GRASS-5.7 Tutorial -- but are being updated and merged into GRASS-6...'''

===Vector network analysis examples===

* New Spearfish examples: [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.html v.net], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.iso.html v.net.iso], [http://grass.osgeo.org/grass63/manuals/html63_user/v.net.path.html v.net.path] etc.
* Old tutorial: http://grass.osgeo.org/grass57/tutorial/network.html

===Complex usage examples===
http://grass.osgeo.org/grass57/tutorial/ex_complex.html

===Examples from US National Atlas===
http://grass.osgeo.org/grass57/tutorial/usa_demo.html

==Additional Information==

===FAQ (Frequently Asked Questions)===

* [[Faq|GRASS Wiki FAQ]]

* [[Grass Six Tutorial Faq]]

* [http://grasswiki.osgeo.org/wiki/GRASS_Help Help and Troubleshooting]

=== References ===

* GRASS [http://grass.osgeo.org/gdp/tutorials.php books and tutorials]

* GRASS [http://www.geostat-course.org/Topic_NetelerMetz_2012 GEOSTAT 2012] course

===Links of interest===

* [http://169.237.35.250/~dylan/grass_user_group/ GRASS-GMT Examples]

==Further reading==

===GRASS and R kriging interpolation===

===Mini How to interpolate using kriging with GRASS and R===

[[How to interpolate point value using kriging method with R and GRASS 6]]

[[Category: Documentation]]
[[Category: Tutorial]]

GRASS 6 Tutorial/Vector data management

2013-07-30T08:15:47Z

⚠️Dmci: /* Grass Six Tutorial Default Settings */

==Vector data management==
===Importing Vector data===
The GRASS modules ''<code>v.in.*</code>'' and '''<code>v.out.*</code>''' handle the importing and exporting of Vector datasets.
<code>v.in.ogr</code> is widely used and has simplified the import of vector data; [http://www.gdal.org/ogr/ogr_formats.html OGR] itself support a wide range of formats.
<code>v.out.ogr</code> always exports the entire vector map

====Importing an ESRI Shapefile====
The following code snippet is a simple usage of <code>v.in.ogr</code>, which imports an ESRI Shapefile into the native vector format:

v.in.ogr dsn=boundary_county.shp out=boundary_county

However, <code>v.in.ogr</code> has many options to import subsets (defined spatially or by SQL) and vector types

The same can be achieved using the GRASS Graphical Interface. The Vector import interface can be accessed through the vector layer manager:

[[File:Vector_layer_manager.png|400px]]
[[File:Vector_layer_import.png|400px]]

You can easily import a '''subset''' of your data by specifying the spatial extent or an SQL query defined within the <code>where</code> command line argument:
v.in.ogr --o dsn=./ output=subset layer=boundary_county where="NAME = 'DUPLIN' OR NAME = 'WAKE'"

+----------------------------------------------------------------------------+
| Layer: subset |
| Mapset: PERMANENT |
| Location: nc_spm_08_geostat |
| Database: /home/daniel/GRASSWiki/data |
| Title: |
| Map scale: 1:1 |
| Map format: native |
| Name of creator: daniel |
| Organization: |
| Source date: Wed Nov 7 16:10:01 2012 |
|----------------------------------------------------------------------------|
| Type of Map: vector (level: 2) |
| |
| Number of points: 0 Number of areas: 2 |
| Number of lines: 0 Number of islands: 2 |
| Number of boundaries: 2 Number of faces: 0 |
| Number of centroids: 2 Number of kernels: 0 |
| |
| Map is 3D: No |
| Number of dblinks: 1 |
| |
| Projection: Lambert Conformal Conic |
| N: 258121.97732598 S: 106860.16001618 |
| E: 732841.78315847 W: 610047.98051883 |
| |
| Digitization threshold: 0 |
| Comments: |
| |
+----------------------------------------------------------------------------+

====Virtual link an ESRI Shapefile====
If you prefer not to import your vector datasets into the native GRASS vector format, you can create a virtual link to it using <code>v.external</code>

This can be done as follows:
v.external dsn=./ output=boundary_county layer=boundary_county
Building topology for vector map <boundary_county>...
Number of nodes: 1707
Number of primitives: 1981
Number of points: 0
Number of lines: 0
Number of boundaries: 1055
Number of centroids: 926
Number of areas: 1055
Number of isles: 1055
Number of areas without centroid: 129

====Import an XY/XYZ ASCII file====

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324
675695|139878
623277|158224
716318|138568
742527|164776
735975|196227
755631|200158

Pipe the coordinates to the module <code>v.in.ascii</code>
cat coords.txt | v.in.ascii out=points

Add the categories to the vector points to facilitate attribute joins:
v.category in=points out=points_final op=add
v.category points_final op=report

You can then add a new attribute table to the vector file using <code>v.db.addtable</code>
v.db.addtable map=points

You can replicate the above procedure for three dimensional data (XYZ), by modifying the <code>v.in.ascii</code> argument list

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324|212
675695|139878|233
623277|158224|211
716318|138568|219
742527|164776|240
735975|196227|221
755631|200158|210

cat coords.txt | v.in.ascii -z out=points

====Import an XY table from a DBMS or Spreadsheet====

If you have a list of coordinates (x,y) with associated attributes stored in a spreadsheet table (DBF, CSV, Excel, etc). It's fairly easy to generate a map from them using <code>v.in.db</code>. In the following example, we import the table, meteostations that has the columns 'east', 'north', 'quota' (z) and some attribute columns.

v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb,user=name" table=meteostations x=east y=north z=quota key=id output=meteostations

This command creates the new vector map (native format) with attributes table in a DBF file.

We can display these points in a display monitor and query them as follows:

d.mon start=x0
d.vect meteostations
d.what.vect

====Importing a DXF file====

Both 2D and 3D DXF files can be imported into GRASS using the module <code>v.in.dxf</code>. This can be done very simply from the command-line as follows
v.in.dxf -1 Masterplanxy.dxf

100%
Following DXF layers found:
Layer 1: line
Building topology for vector map <Masterplanxy>...
Registering primitives...
64302 primitives registered
405521 vertices registered
Building areas...
100%
0 areas built
0 isles built
Attaching islands...
Attaching centroids...
100%
Number of nodes: 71142
Number of primitives: 64302
Number of points: 0
Number of lines: 64302
Number of boundaries: 0
Number of centroids: 0
Number of areas: 0
Number of isles: 0

This can also be done using the GUI interface

[[File:import_dxf.png|400px]]

And then visualised within the map display

[[File:dxf_display.png|400px]]

===Exporting Vector data===

Using the module <code>v.out.ogr</code> it is possible to export native GRASS Vector data to a range of formats:
ESRI_Shapefile,MapInfo_File,TIGER,S57,DGN,Memory,BNA,CSV,GML,GPX,KML,GeoJSON,GMT,SQLite,ODBC,MSSQLSpatial,
PostgreSQL,MySQL,PCIDSK,DXF,Geoconcept,GeoRSS,GPSTrackMaker,PGDump,GPSBabel,

[[File:Vector_out_ogr.png|400px]]
[[File:Vector_layer_export.png|400px]]

Introductory information on [http://grass.ibiblio.org/grass63/manuals/html63_user/vectorintro.html vector data processing] is available from the help manual.

===[[Grass Six Tutorial Attribute Management]]===
http://grass.osgeo.org/grass57/tutorial/attrib_storage.html
- General notes on Attribute
management; Managing the default settings; Examples;
Database Schema

GRASS 6 Tutorial/Vector data management

2013-07-30T08:14:28Z

⚠️Dmci: /* Grass Six Tutorial Geometry Management */

==Vector data management==
===Importing Vector data===
The GRASS modules ''<code>v.in.*</code>'' and '''<code>v.out.*</code>''' handle the importing and exporting of Vector datasets.
<code>v.in.ogr</code> is widely used and has simplified the import of vector data; [http://www.gdal.org/ogr/ogr_formats.html OGR] itself support a wide range of formats.
<code>v.out.ogr</code> always exports the entire vector map

====Importing an ESRI Shapefile====
The following code snippet is a simple usage of <code>v.in.ogr</code>, which imports an ESRI Shapefile into the native vector format:

v.in.ogr dsn=boundary_county.shp out=boundary_county

However, <code>v.in.ogr</code> has many options to import subsets (defined spatially or by SQL) and vector types

The same can be achieved using the GRASS Graphical Interface. The Vector import interface can be accessed through the vector layer manager:

[[File:Vector_layer_manager.png|400px]]
[[File:Vector_layer_import.png|400px]]

You can easily import a '''subset''' of your data by specifying the spatial extent or an SQL query defined within the <code>where</code> command line argument:
v.in.ogr --o dsn=./ output=subset layer=boundary_county where="NAME = 'DUPLIN' OR NAME = 'WAKE'"

+----------------------------------------------------------------------------+
| Layer: subset |
| Mapset: PERMANENT |
| Location: nc_spm_08_geostat |
| Database: /home/daniel/GRASSWiki/data |
| Title: |
| Map scale: 1:1 |
| Map format: native |
| Name of creator: daniel |
| Organization: |
| Source date: Wed Nov 7 16:10:01 2012 |
|----------------------------------------------------------------------------|
| Type of Map: vector (level: 2) |
| |
| Number of points: 0 Number of areas: 2 |
| Number of lines: 0 Number of islands: 2 |
| Number of boundaries: 2 Number of faces: 0 |
| Number of centroids: 2 Number of kernels: 0 |
| |
| Map is 3D: No |
| Number of dblinks: 1 |
| |
| Projection: Lambert Conformal Conic |
| N: 258121.97732598 S: 106860.16001618 |
| E: 732841.78315847 W: 610047.98051883 |
| |
| Digitization threshold: 0 |
| Comments: |
| |
+----------------------------------------------------------------------------+

====Virtual link an ESRI Shapefile====
If you prefer not to import your vector datasets into the native GRASS vector format, you can create a virtual link to it using <code>v.external</code>

This can be done as follows:
v.external dsn=./ output=boundary_county layer=boundary_county
Building topology for vector map <boundary_county>...
Number of nodes: 1707
Number of primitives: 1981
Number of points: 0
Number of lines: 0
Number of boundaries: 1055
Number of centroids: 926
Number of areas: 1055
Number of isles: 1055
Number of areas without centroid: 129

====Import an XY/XYZ ASCII file====

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324
675695|139878
623277|158224
716318|138568
742527|164776
735975|196227
755631|200158

Pipe the coordinates to the module <code>v.in.ascii</code>
cat coords.txt | v.in.ascii out=points

Add the categories to the vector points to facilitate attribute joins:
v.category in=points out=points_final op=add
v.category points_final op=report

You can then add a new attribute table to the vector file using <code>v.db.addtable</code>
v.db.addtable map=points

You can replicate the above procedure for three dimensional data (XYZ), by modifying the <code>v.in.ascii</code> argument list

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324|212
675695|139878|233
623277|158224|211
716318|138568|219
742527|164776|240
735975|196227|221
755631|200158|210

cat coords.txt | v.in.ascii -z out=points

====Import an XY table from a DBMS or Spreadsheet====

If you have a list of coordinates (x,y) with associated attributes stored in a spreadsheet table (DBF, CSV, Excel, etc). It's fairly easy to generate a map from them using <code>v.in.db</code>. In the following example, we import the table, meteostations that has the columns 'east', 'north', 'quota' (z) and some attribute columns.

v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb,user=name" table=meteostations x=east y=north z=quota key=id output=meteostations

This command creates the new vector map (native format) with attributes table in a DBF file.

We can display these points in a display monitor and query them as follows:

d.mon start=x0
d.vect meteostations
d.what.vect

====Importing a DXF file====

Both 2D and 3D DXF files can be imported into GRASS using the module <code>v.in.dxf</code>. This can be done very simply from the command-line as follows
v.in.dxf -1 Masterplanxy.dxf

100%
Following DXF layers found:
Layer 1: line
Building topology for vector map <Masterplanxy>...
Registering primitives...
64302 primitives registered
405521 vertices registered
Building areas...
100%
0 areas built
0 isles built
Attaching islands...
Attaching centroids...
100%
Number of nodes: 71142
Number of primitives: 64302
Number of points: 0
Number of lines: 64302
Number of boundaries: 0
Number of centroids: 0
Number of areas: 0
Number of isles: 0

This can also be done using the GUI interface

[[File:import_dxf.png|400px]]

And then visualised within the map display

[[File:dxf_display.png|400px]]

===Exporting Vector data===

Using the module <code>v.out.ogr</code> it is possible to export native GRASS Vector data to a range of formats:
ESRI_Shapefile,MapInfo_File,TIGER,S57,DGN,Memory,BNA,CSV,GML,GPX,KML,GeoJSON,GMT,SQLite,ODBC,MSSQLSpatial,
PostgreSQL,MySQL,PCIDSK,DXF,Geoconcept,GeoRSS,GPSTrackMaker,PGDump,GPSBabel,

[[File:Vector_out_ogr.png|400px]]
[[File:Vector_layer_export.png|400px]]

Introductory information on [http://grass.ibiblio.org/grass63/manuals/html63_user/vectorintro.html vector data processing] is available from the help manual.

===[[Grass Six Tutorial Default Settings]]===
- Default settings for vector geometry;
for vector attributes; for db.* modules

===[[Grass Six Tutorial Attribute Management]]===
http://grass.osgeo.org/grass57/tutorial/attrib_storage.html
- General notes on Attribute
management; Managing the default settings; Examples;
Database Schema

GRASS 6 Tutorial/Vector data management

2013-07-30T08:11:39Z

⚠️Dmci: /* Import an XY/XYZ ASCII file */

==Vector data management==
===Importing Vector data===
The GRASS modules ''<code>v.in.*</code>'' and '''<code>v.out.*</code>''' handle the importing and exporting of Vector datasets.
<code>v.in.ogr</code> is widely used and has simplified the import of vector data; [http://www.gdal.org/ogr/ogr_formats.html OGR] itself support a wide range of formats.
<code>v.out.ogr</code> always exports the entire vector map

====Importing an ESRI Shapefile====
The following code snippet is a simple usage of <code>v.in.ogr</code>, which imports an ESRI Shapefile into the native vector format:

v.in.ogr dsn=boundary_county.shp out=boundary_county

However, <code>v.in.ogr</code> has many options to import subsets (defined spatially or by SQL) and vector types

The same can be achieved using the GRASS Graphical Interface. The Vector import interface can be accessed through the vector layer manager:

[[File:Vector_layer_manager.png|400px]]
[[File:Vector_layer_import.png|400px]]

You can easily import a '''subset''' of your data by specifying the spatial extent or an SQL query defined within the <code>where</code> command line argument:
v.in.ogr --o dsn=./ output=subset layer=boundary_county where="NAME = 'DUPLIN' OR NAME = 'WAKE'"

+----------------------------------------------------------------------------+
| Layer: subset |
| Mapset: PERMANENT |
| Location: nc_spm_08_geostat |
| Database: /home/daniel/GRASSWiki/data |
| Title: |
| Map scale: 1:1 |
| Map format: native |
| Name of creator: daniel |
| Organization: |
| Source date: Wed Nov 7 16:10:01 2012 |
|----------------------------------------------------------------------------|
| Type of Map: vector (level: 2) |
| |
| Number of points: 0 Number of areas: 2 |
| Number of lines: 0 Number of islands: 2 |
| Number of boundaries: 2 Number of faces: 0 |
| Number of centroids: 2 Number of kernels: 0 |
| |
| Map is 3D: No |
| Number of dblinks: 1 |
| |
| Projection: Lambert Conformal Conic |
| N: 258121.97732598 S: 106860.16001618 |
| E: 732841.78315847 W: 610047.98051883 |
| |
| Digitization threshold: 0 |
| Comments: |
| |
+----------------------------------------------------------------------------+

====Virtual link an ESRI Shapefile====
If you prefer not to import your vector datasets into the native GRASS vector format, you can create a virtual link to it using <code>v.external</code>

This can be done as follows:
v.external dsn=./ output=boundary_county layer=boundary_county
Building topology for vector map <boundary_county>...
Number of nodes: 1707
Number of primitives: 1981
Number of points: 0
Number of lines: 0
Number of boundaries: 1055
Number of centroids: 926
Number of areas: 1055
Number of isles: 1055
Number of areas without centroid: 129

====Import an XY/XYZ ASCII file====

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324
675695|139878
623277|158224
716318|138568
742527|164776
735975|196227
755631|200158

Pipe the coordinates to the module <code>v.in.ascii</code>
cat coords.txt | v.in.ascii out=points

Add the categories to the vector points to facilitate attribute joins:
v.category in=points out=points_final op=add
v.category points_final op=report

You can then add a new attribute table to the vector file using <code>v.db.addtable</code>
v.db.addtable map=points

You can replicate the above procedure for three dimensional data (XYZ), by modifying the <code>v.in.ascii</code> argument list

You can easily generate a GRASS point vector file from a text file containing X,Y coordinates.
642934|95324|212
675695|139878|233
623277|158224|211
716318|138568|219
742527|164776|240
735975|196227|221
755631|200158|210

cat coords.txt | v.in.ascii -z out=points

====Import an XY table from a DBMS or Spreadsheet====

If you have a list of coordinates (x,y) with associated attributes stored in a spreadsheet table (DBF, CSV, Excel, etc). It's fairly easy to generate a map from them using <code>v.in.db</code>. In the following example, we import the table, meteostations that has the columns 'east', 'north', 'quota' (z) and some attribute columns.

v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb,user=name" table=meteostations x=east y=north z=quota key=id output=meteostations

This command creates the new vector map (native format) with attributes table in a DBF file.

We can display these points in a display monitor and query them as follows:

d.mon start=x0
d.vect meteostations
d.what.vect

====Importing a DXF file====

Both 2D and 3D DXF files can be imported into GRASS using the module <code>v.in.dxf</code>. This can be done very simply from the command-line as follows
v.in.dxf -1 Masterplanxy.dxf

100%
Following DXF layers found:
Layer 1: line
Building topology for vector map <Masterplanxy>...
Registering primitives...
64302 primitives registered
405521 vertices registered
Building areas...
100%
0 areas built
0 isles built
Attaching islands...
Attaching centroids...
100%
Number of nodes: 71142
Number of primitives: 64302
Number of points: 0
Number of lines: 64302
Number of boundaries: 0
Number of centroids: 0
Number of areas: 0
Number of isles: 0

This can also be done using the GUI interface

[[File:import_dxf.png|400px]]

And then visualised within the map display

[[File:dxf_display.png|400px]]

===Exporting Vector data===

Using the module <code>v.out.ogr</code> it is possible to export native GRASS Vector data to a range of formats:
ESRI_Shapefile,MapInfo_File,TIGER,S57,DGN,Memory,BNA,CSV,GML,GPX,KML,GeoJSON,GMT,SQLite,ODBC,MSSQLSpatial,
PostgreSQL,MySQL,PCIDSK,DXF,Geoconcept,GeoRSS,GPSTrackMaker,PGDump,GPSBabel,

[[File:Vector_out_ogr.png|400px]]
[[File:Vector_layer_export.png|400px]]

Introductory information on [http://grass.ibiblio.org/grass63/manuals/html63_user/vectorintro.html vector data processing] is available from the help manual.

===[[Grass Six Tutorial Default Settings]]===
- Default settings for vector geometry;
for vector attributes; for db.* modules

===[[Grass Six Tutorial Geometry Management]]===
http://grass.osgeo.org/grass57/tutorial/geom_storage.html
- General notes on Geometry
management; Managing the default settings;
GRASS vector architecture; Geometry stored in native format;
Geometry stored in SHAPE file;
Import/export of vector data Geometry;
Generating vector geometry from various sources

===[[Grass Six Tutorial Attribute Management]]===
http://grass.osgeo.org/grass57/tutorial/attrib_storage.html
- General notes on Attribute
management; Managing the default settings; Examples;
Database Schema

GRASS 6 Tutorial/Vector spatial analysis

2013-07-29T09:57:38Z

⚠️Dmci: /* Vector Analysis using the GUI */

==Vector Spatial Analysis==

The following examples demonstrate how basic vector data processing operations, such as overlay, union and clipping can be performed in GRASS 6.4. These operations are all performed using the GRASS module, [http://grass.osgeo.org/grass64/manuals/v.overlay.html <code>v.overlay</code>], which can either be run using the GUI or from the command-line interface. The following examples are demonstrated using the CLI, using two vector datasets, namely: <code>urbanarea</code> and <code>census_wake2000</code> from the North Carolina database.

d.mon start=x0
g.region vect=census_wake2000
d.vect census_wake2000 col=blue
d.vect urbanarea col=red type=boundary

[[File:Census and urban.png|300px|center]]

===Vector Union===

The following command creates a union (operator <code>or</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or

with urban_census2000 created as follows.

[[File: Census_urban_union.png|300px|center]]

===Vector Intersection===

The following command creates an intersection (operator <code>and</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=and

[[File: Census_urban_intersect.png|300px|center]]

===Vector Clip===

The following command clips (cuts out) intersection (operator <code>not</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not

[[File: Census_urban_clip.png|300px|center]]

==Vector Analysis using the GUI==

The above examples can be easily replicated using the <code>v.overlay</code> GUI, available under ''Vector --> Overlay Vector Maps --> Overlay Vector Maps [v.overlay]''. The default tab allows you to select the two vector files (ainput and binput):

[[File: Voverlay_gui.png|300px|center]]

The second tab ('Optional') allows you to specify the vector operator (or, and, not, ...) as well as other options:

[[File: Voverlay_gui2.png|300px|center]]

Once you have made your selections, simply click '''Run'''

GRASS 6 Tutorial/Vector spatial analysis

2013-07-29T09:56:44Z

⚠️Dmci: /* Vector Analysis using the GUI */

GRASS 6 Tutorial/Vector spatial analysis

2013-07-29T09:56:16Z

⚠️Dmci: /* Vector Analysis using the GUI */

==Vector Spatial Analysis==

The following examples demonstrate how basic vector data processing operations, such as overlay, union and clipping can be performed in GRASS 6.4. These operations are all performed using the GRASS module, [http://grass.osgeo.org/grass64/manuals/v.overlay.html <code>v.overlay</code>], which can either be run using the GUI or from the command-line interface. The following examples are demonstrated using the CLI, using two vector datasets, namely: <code>urbanarea</code> and <code>census_wake2000</code> from the North Carolina database.

d.mon start=x0
g.region vect=census_wake2000
d.vect census_wake2000 col=blue
d.vect urbanarea col=red type=boundary

[[File:Census and urban.png|300px|center]]

===Vector Union===

The following command creates a union (operator <code>or</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or

with urban_census2000 created as follows.

[[File: Census_urban_union.png|300px|center]]

===Vector Intersection===

The following command creates an intersection (operator <code>and</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=and

[[File: Census_urban_intersect.png|300px|center]]

===Vector Clip===

The following command clips (cuts out) intersection (operator <code>not</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not

[[File: Census_urban_clip.png|300px|center]]

==Vector Analysis using the GUI==

The above examples can be easily replicated using the <code>v.overlay</code> GUI, available under ''Vector --> Overlay Vector Maps --> Overlay Vector Maps [v.overlay]''. The default tab allows you to select the two vector files (ainput and binput):

[[File: Voverlay_gui.png|300px|center]]

The second tab ('Options') allows you to specify the vector operator (or, and, not, etc.) as well as other options:

[[File: Voverlay_gui2.png|300px|center]]

GRASS 6 Tutorial/Vector spatial analysis

2013-07-29T09:54:21Z

⚠️Dmci: /* Vector Analysis using the GUI */

==Vector Spatial Analysis==

The following examples demonstrate how basic vector data processing operations, such as overlay, union and clipping can be performed in GRASS 6.4. These operations are all performed using the GRASS module, [http://grass.osgeo.org/grass64/manuals/v.overlay.html <code>v.overlay</code>], which can either be run using the GUI or from the command-line interface. The following examples are demonstrated using the CLI, using two vector datasets, namely: <code>urbanarea</code> and <code>census_wake2000</code> from the North Carolina database.

d.mon start=x0
g.region vect=census_wake2000
d.vect census_wake2000 col=blue
d.vect urbanarea col=red type=boundary

[[File:Census and urban.png|300px|center]]

===Vector Union===

The following command creates a union (operator <code>or</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000 operator=or

with urban_census2000 created as follows.

[[File: Census_urban_union.png|300px|center]]

===Vector Intersection===

The following command creates an intersection (operator <code>and</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=and

[[File: Census_urban_intersect.png|300px|center]]

===Vector Clip===

The following command clips (cuts out) intersection (operator <code>not</code>) of the two polygon vectors:

v.overlay ain=census_wake2000 bin=urbanarea out=urban_census2000_intersect operator=not

[[File: Census_urban_clip.png|300px|center]]

==Vector Analysis using the GUI==

The above examples can be easily replicated using the <code>v.overlay</code> GUI, avaialble under 'Vector --> Overlay Vector Maps --> Overlay Vector Maps [v.overlay]'

[[File: Voverlay_gui.png|300px|center]]

[[File: Voverlay_gui2.png|300px|center]]