GRASS-Wiki - User contributions [en]

GRASS-Wiki

2007-09-17T18:38:04Z

⚠️Gnelson: /* Getting started */

[[Image:grasslogo_vector_small.png|center]]
== Welcome to the GRASS-Wiki ==
<div align="right">''''' A Wiki is a collaborative help system '''''</div>
__NOTOC__


[http://grass.itc.it The Geographic Resources Analysis Support System], commonly referred to as '''GRASS''', is a Geographic Information System ([http://en.wikipedia.org/wiki/Gis GIS]) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. GRASS WIKI offers the official community platform of the GRASS GIS project.

On this Wiki, you can get and contribute to GRASS related information, documents and add-ons programs.

=== Getting started ===
* [[GRASS Help|GRASS Help and Getting Started]]
* [[GRASS and its siblings; a guide for the novice]]
* [[GRASS Documents|Full GRASS Documentation]]
* [[Installation Guide]] for precompiled binaries
* [[Faq|FAQ]]

=== Community ===
* [[GRASS Community]]: Getting in touch
* [[GRASS migration hints|Migrating to GRASS]]
* [[GRASS Blogger]]
* Get involved: [[Project jobs]]
* [http://grass.gdf-hannover.de/wiki/Special:Recentchanges?feed=rss RSS feed] of recent changes of this Wiki

=== Development ===
* [[Development|GRASS Development]]
* [[Release Roadmap]]
* [[Compile and Install]] of Source Code

=== Download ===
* [[GRASS AddOns]]
* [[Promotional material]]

GRASS and its siblings; a guide for the novice

2007-09-17T18:37:52Z

⚠️Gnelson:

There are many open-source software packages that deal with spatial data in some way and are also related to GRASS. This page provides a brief overview of history, current status, and platforms. It is based on a nice summary prepared by Michael Barton and will hopefully be edited by many people.

=GRASS=
GRASS is written primarily in C, with many additional modules created as
BASH scripts that chain together C modules. The GUI needs to be something
that works well with C, is cross-platform, and relatively easy to work with.
TclTk (used for the default GUI) fits these criteria very well. We are in
the process of switching the GUI to wxPython, which also fits these criteria
and is an even richer GUI development platform. There is a talented team of
folks working on the wxPython GUI, so development is going quite fast.

It originally ran only under linux but recent ports to Windows and the MacOS are nearing completion as of September 2007.

=QGIS=
QGIS is basically an easy to use viewer for geospatial data. A couple years
ago, Radim Blazek--a former GRASS developer--joined the QGIS project. He has
made a number of GRASS processes available to QGIS through its plugin
architecture to give QGIS some nice analytical capabilities. QGIS is written
in C++ I think, and its GUI is done in QT.

=JGRASS=
jgrass was started some years back, when GRASS had a pretty primitive GUI.
As best I can tell, it creates a GUI in JAVA and uses GRASS libraries to
carry out a limited suite of geospatial processing activities (mainly
hydrologic modeling). For a long time, jgrass was using the GRASS 5
libraries. I don't know if it has upgraded to GRASS 6 or not. As of a year
ago, jgrass merged into uDIG, and I don't know if it is still using GRASS
libraries as a geospatial analysis engine or not.

GRASS and its siblings; a guide to the novice

2007-09-17T18:05:15Z

⚠️Gnelson:

GRASS-Wiki

2007-09-17T17:59:24Z

⚠️Gnelson: /* Getting started */

[[Image:grasslogo_vector_small.png|center]]
== Welcome to the GRASS-Wiki ==
<div align="right">''''' A Wiki is a collaborative help system '''''</div>
__NOTOC__


[http://grass.itc.it The Geographic Resources Analysis Support System], commonly referred to as '''GRASS''', is a Geographic Information System ([http://en.wikipedia.org/wiki/Gis GIS]) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. GRASS WIKI offers the official community platform of the GRASS GIS project.

On this Wiki, you can get and contribute to GRASS related information, documents and add-ons programs.

=== Getting started ===
* [[GRASS Help|GRASS Help and Getting Started]]
* [[GRASS and its siblings; a guide to the novice]]
* [[GRASS Documents|Full GRASS Documentation]]
* [[Installation Guide]] for precompiled binaries
* [[Faq|FAQ]]

=== Community ===
* [[GRASS Community]]: Getting in touch
* [[GRASS migration hints|Migrating to GRASS]]
* [[GRASS Blogger]]
* Get involved: [[Project jobs]]
* [http://grass.gdf-hannover.de/wiki/Special:Recentchanges?feed=rss RSS feed] of recent changes of this Wiki

=== Development ===
* [[Development|GRASS Development]]
* [[Release Roadmap]]
* [[Compile and Install]] of Source Code

=== Download ===
* [[GRASS AddOns]]
* [[Promotional material]]

HOWTO import USGS elevation data

2007-07-12T19:20:42Z

⚠️Gnelson:

The US Geological Survey offers a variety of digital elevation models through the [http://seamless.usgs.gov/website/seamless/viewer.php Seamless Distribution System]. Here is an approach to working with them in GRASS.

== Importing USGS 1/3" NED datasets into GRASS ==

1. '''Download the datasets you desire.''' They will arrive in a zip archive of a directory containing a subdirectory containing a file called w001001.adf, which is the main data file (tip: this is the biggest file).

2. '''Create a new GRASS location to work with the DEMs.'''
<BR>From a GRASS shell:
: <code>cd 18437824/18437824</code> ''(example directory names --- replace with your actual names)''
: <code>r.in.gdal location=''name_of_your_new_location'' in=w001001.adf out=dem</code>

3. '''Start GRASS''' (or restart) in the new location.
: <code>grass name_of_your_new_location/PERMANENT</code>

4. Import additional files as needed (note the <code>-e</code> flag, which causes the location's bounds to be extended to accomodate the new data):
: <code>r.in.gdal -e in=w001001.adf out=dem2</code>
: ''.. etc.''

5. Use r.patch to combine the tiles into one continuous map, if desired.

Note that you can also download SRTM 90 data in tif format from http://srtm.csi.cgiar.org/. These come in 5 degree by 5 degree tiles.

[[Category:FAQ]]

Add a FAQ

2007-05-05T18:19:59Z

⚠️Gnelson:

'''Q:''' How do I add a new FAQ to this set of questions?

'''A:''' Point your browser to http://grass.gdf-hannover.de/wiki/ and add the new FAQ title after the last /. For example, if you want to add a new FAQ titled "Add another new FAQ" just go enter http://grass.gdf-hannover.de/wiki/Add another new FAQ.

Don't forget to add
<pre>[[Category:FAQ]]</pre>

at the end so other users can find it in the FAQ.

[[Category:FAQ]]

Add a FAQ

2007-05-05T18:18:25Z

⚠️Gnelson:

'''Q:''' How do I add a new FAQ to this set of questions?

'''A:''' Point your browser to http://grass.gdf-hannover.de/wiki/ and add the new FAQ title after the last /. For example, if you want to add a new FAQ titled "Add another new FAQ" just go enter http://grass.gdf-hannover.de/wiki/Add another new FAQ.

Don't forget to add "<pre>[[Category:FAQ]]</pre>" at the end.

[[Category:FAQ]]

2006-12-12T14:54:06Z

⚠️Gnelson: /* Import/Export and Display */

<h1> Mini-tutorials showcasing some common GIS taks </h1>

== Import/Export and Display ==

* Import and display SRTM elevation data
** ''GRASS Newsletter, 3, June 2005.'' - http://grass.itc.it/newsletter/GRASSNews_vol3.pdf

* Import and display VMap0 Digital Chart of the World
** ''GRASS Newsletter, 3, June 2005.'' - http://grass.itc.it/newsletter/GRASSNews_vol3.pdf

* Import and display ETOPO2 world elevation and bathymetry dataset
** ''Global dataset of bathymetry and topography. GRASS Newsletter, 1:8-11, August 2004.''

== GIS Tasks ==

* [[Georeferencing | Georectify a scanned raster image]]
** r.in.gdal into XY location
** GUI georectifier
** i.points + i.rectify (alternate method)

* [[Trace vector contours from a scanned map]]

* Create a DEM from contour lines and trig points
** r.surf.contour

* Create a DEM from x,y,z point data
** v.surf.rst
** v.surf.idw
** v.surf.bspline
** r.surf.nnbathy

* Create vector contour lines from a raster DEM
** r.contour

== 3D Visualization ==

* Use NVIZ to render a 3D image
nviz elevation.dem

* Use NVIZ to make a fly through movie
** see nviz keyframe animation panel help page
** [[Movies | Encoding Movies]]

* Use Paraview to render a 3D image
** r.out.vtk, v.out.vtk

== Raster operations ==

* Create a shaded relief map
** r.shaded relief

* drape semi-transparent land use map over shaded relief map
** d.his

== Vector operations ==

* Disolve interior lines
** v.dissolve

== Hardcopy and Presention Graphics Creation ==

* Create a high quality hardcopy plot
** Creating PostScript with [[Ps.map_scripts | ps.map]]
** export to GMT

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

WinGRASS 6 Current Status

2006-10-30T21:17:04Z

⚠️Gnelson: /* Known problems */

__TOC__

This page describes the current status of winGRASS development. Precompiled native winGRASS packages are available [http://geni.ath.cx/grass.html here].

== What is missing? ==

* Display drivers: socket
** Use gis.m instead of monitors.
** Make gis.m Output window more like xterm. No need to hit Run.
** Is there any way that the Map Display in gis.m can interact with console commands? IPC? File Alteration Monitor?
* i.class: SIGALRM, SIGTSTP (are these signals important?)
* wait() in:
** i.ortho.photo/photo.2image: wait()
** i.ortho.photo/photo.2target: wait()
** i.points: wait()
** i.vpoints: wait()
** Note: also in lib/gis/popen.c and lib/gis/system.c (use those implementations?)
* r.terraflow: getrusage()

== Known problems ==

* metacharacter escape in "sh -c '$cmd'"
* modules not working: r.proj (v.proj too?), r.surf.rst, v.neighbors, v.kernel, r.cost
* Cannot open Help pages.
* Have to add c:\mingw\bin to PATH on some systems.
** You should have typed c:/mingw instead of c:\mingw when asked by the MinGW installer.
* Have to type "exit" in the console to save ~/.grassrc file. Then, close gis.m to finish the session.
* A previous installation of grass under cygwin is likely to cause problems with WinGrass. Follow the directions to remove cygwin at http://cygwin.com/faq/faq-nochunks.html#faq.setup.uninstall-all

The following items cannot be fixed in the near future:
* Cannot display a thematic layer.
** d.vect.thematic requires PNG driver, which is not available in winGRASS.
** can't read "_data(.gronsole.gronsole,4,donecmd)": no such element in array error
** Aqua TclTk solution: http://intevation.de/rt/webrt?serial_num=5096&display=History

== TclTk issues ==

* cannot run shell scripts: only .com, .exe, .bat
** sh -c '$cmd'
* var=val style argument is not valid for batch files: equal sign is a separator like a space. http://support.microsoft.com/?kbid=71247 http://www.gatago.com/alt/msdos/batch/17358926.html
** need .exe wrapper for shell scripts? grass-xterm-wrapper.exe
* file command returns bad code (catch is needed): http://sources.redhat.com/ml/insight/2003-q1/msg00079.html
** catch {file copy}
** catch {file delete}
** catch {file rename -force} does not work. Delete old file first: catch {file delete}; catch {file rename}
* file redirection (>@stdout, 2>@stderr) does not work: http://wiki.tcl.tk/672
** exec a batch file doing redirection (>&2, 2>&1)
* no -permissions file attributes
** catch {file attributes -permissions}

== Other libraries ==

GDAL
* lib/gis/OBJ.*/fmode.o is needed for any GRASS related modules.
* modified ltmain.sh to install binary files from wrapper scripts.