GRASS-Wiki - User contributions [en]

Country Data Processing

2007-07-07T12:10:58Z

⚠️Martii: /* Creating New Location */

This tutorial describes how to
* find free data of country on Internet
* create new GRASS location
* import found data into GRASS
* create new vector layers from existing data
* create labels
* display map of a country

= GRASS Installation =
Required elements
* GRASS GIS system installed
* download SPEARFISH data http://grass.itc.it/sampledata/spearfish_grass60data-0.3.tar.gz

Create directory structure required for this tutorial
* dataset directory
$ mkdir ~/grass
* input data directory
$ mkdir ~/grass/indata

Create GRASS location using SPEARFISH data to be able create new locations

$ cd ~/grass
$ tar zxf spearfish_grass60data-0.3.tar.gz

Start GRASS

$ grass -text spearfish60/PERMANENT

= Obtaining Data =

We assume that one wants to create UK map. Following steps can be easily
applied to other countries' data.

Country related GIS data can be obtained from
[http://www.maproom.psu.edu/dcw/ Digital Chart of the World].

First create country related input directory

$ mkdir ~/grass/indata/uk

Let's download UK data
* go to [http://www.maproom.psu.edu/dcw/ Digital Chart of the World]
* click Europe link
* choose United Kingdom in select box on the right and click Continue
* page _Digital Chart of the World Layer Interface for United Kingdom_ will be displayed
* click Download Data button
* another page will be shown, mark checkboxes
** Populated Places (Polygon)
** Roads (Line)
** Rail Roads (Line)
* click Continue
* on new page click Compute Data
* on new page you will be able to obtain set of data (<NUMBER> is part of filename with data exported by DCW)
<NUMBER>.tar.Z
* do not hesistate to download data into ~/grass/indata/uk directory

= Importing Data =
Importing data into GRASS is two fold step
* create new location with one piece of data
* import remaining data

== Creating New Location ==
One can create new location using another location. We will use SPEARFISH location
to create UK location.

Start GRASS

$ cd ~/grass
$ grass62 -text spearfish60/PERMANENT (you need grass 6.2.x for this to work)

Enter UK input data directory and unpack downloaded data from DCW

$ cd indata/uk
$ tar zxf <NUMBER>.tar.Z

You will have several files
;ponet.e00: country borders
;pppoly.e00: populated places
;rdline.e00: road network
;rrline.e00: rail road network

We will create UK GRASS location using country borders. In SPEARFISH GRASS session
use following commands to create location uk and layer borders

$ cd ~/grass
$ v.in.ogr dsn=indata/uk/ponet.e00 layer=ARC output=borders location=uk

New location is created. Exit SPEARFISH GRASS session and start GRASS UK session

$ cd ~/grass
$ grass62 -text uk/PERMANENT

You can display UK borders

$ g.region vect=borders # set region to display
$ d.mon x0 # create GRASS monitor
$ d.vect map=borders # display borders

== Importing Rest of the Data ==

Having GRASS UK location we can import rest of the data (population places,
road and rail networks)

$ cd ~/grass
$ grass -text uk/PERMANENT
$ v.in.ogr dsn=indata/uk/pppoly.e00 layer=ARC output=pcities
$ v.in.ogr dsn=indata/uk/rdline.e00 layer=ARC output=roads
$ v.in.ogr dsn=indata/uk/rrline.e00 layer=ARC output=rails

Display data

$ d.mon x0
$ g.region vect=borders
$ d.vect map=borders color=black width=1.2
$ d.vect map=roads color=grey
$ d.vect map=pcities color=brown

Country Data Processing

2007-07-07T11:51:41Z

⚠️Martii: /* Creating New Location */

This tutorial describes how to
* find free data of country on Internet
* create new GRASS location
* import found data into GRASS
* create new vector layers from existing data
* create labels
* display map of a country

= GRASS Installation =
Required elements
* GRASS GIS system installed
* download SPEARFISH data http://grass.itc.it/sampledata/spearfish_grass60data-0.3.tar.gz

Create directory structure required for this tutorial
* dataset directory
$ mkdir ~/grass
* input data directory
$ mkdir ~/grass/indata

Create GRASS location using SPEARFISH data to be able create new locations

$ cd ~/grass
$ tar zxf spearfish_grass60data-0.3.tar.gz

Start GRASS

$ grass -text spearfish60/PERMANENT

= Obtaining Data =

We assume that one wants to create UK map. Following steps can be easily
applied to other countries' data.

Country related GIS data can be obtained from
[http://www.maproom.psu.edu/dcw/ Digital Chart of the World].

First create country related input directory

$ mkdir ~/grass/indata/uk

Let's download UK data
* go to [http://www.maproom.psu.edu/dcw/ Digital Chart of the World]
* click Europe link
* choose United Kingdom in select box on the right and click Continue
* page _Digital Chart of the World Layer Interface for United Kingdom_ will be displayed
* click Download Data button
* another page will be shown, mark checkboxes
** Populated Places (Polygon)
** Roads (Line)
** Rail Roads (Line)
* click Continue
* on new page click Compute Data
* on new page you will be able to obtain set of data (<NUMBER> is part of filename with data exported by DCW)
<NUMBER>.tar.Z
* do not hesistate to download data into ~/grass/indata/uk directory

== Importing Data ==
Importing data into GRASS is two fold step
* create new location with one piece of data
* import remaining data

=== Creating New Location ===
One can create new location using another location. We will use SPEARFISH location
to create UK location.

Start GRASS

$ cd ~/grass
$ grass -text spearfish60/PERMANENT

Enter UK input data directory and unpack downloaded data from DCW

$ cd indata/uk
$ tar zxf <NUMBER>.tar.Z

You will have several files
;ponet.e00: country borders
;pppoly.e00: populated places
;rdline.e00: road network
;rrline.e00: rail road network

We will create UK GRASS location using country borders. In SPEARFISH GRASS session
use following commands to create location uk and layer borders

$ cd ~/grass
$ v.in.ogr dsn=indata/uk/ponet.e00 layer=ARC output=borders location=uk

New location is created. Exit SPEARFISH GRASS session and start GRASS UK session

$ cd ~/grass
$ grass uk/PERMANENT

Country Data Processing

2007-07-07T11:20:10Z

⚠️Martii: /* GRASS Installation */

Country Data Processing

2007-07-07T11:19:46Z

⚠️Martii: /* GRASS Installation */