[GRASSLIST:7616] Vector area.

GRASS GRASS user
1

Hallo,
i tried to convert a raster map in GRASS6 with the command r.to.vect and it
gives to me a segmentation fault. Then I tried with GRASS5 and it goes well
with the command r.poly.

The problem is that with r.poly I have just the polylines and the boundaries
of the area but non the areas and the centroids that I need.

I will ask if someone knows how can I add the "features" area and centroids to
my vector map, or what command use to convert the raster map in vector with
areas.

Thanks in advance...

Silvia
--
____________________________________________________________________________
HydroloGIS - Environmental Open Source Solutions
Via Siemens, 19
39100 Bolzano
www.hydrologis.com

Silvia Franceschi
Environmental Engineer
tel: +390471068066
mobile: +393384501332
email: silvia.franceschi@hydrologis.com
____________________________________________________________________________

2

Hi all,

Is there any documentation/hands on/examples available of grid3D
creation and Voxel visualization in Grass 6?

thanks,
-Jeroen

3

On Wed, Jul 20, 2005 at 09:16:58AM +0000, Jeroen Wortel wrote:

Hi all,

Is there any documentation/hands on/examples available of grid3D
creation and Voxel visualization in Grass 6?

The documentation written for GRASS 5 is still usable with
a few changes. In case you are using our book (preferably the
second edition 2004), these simple modifications are needed

http://mpa.itc.it/grasstutor/grass6/index.html#cha7
-> p. 172-173

For other documentation please refer to the ModulePortingList in the
Wiki:
http://grass.gdf-hannover.de/twiki/bin/view/GRASS/ModulePortingList#Volume_modules

To warm up, the "Slovakia 3D precipitation data set" is very useful:

http://mpa.itc.it/grasstutor/data_menu2nd.phtml
-> slovakia3d.tar.gz
-> see README there

Note that NVIZ has a bug to visualize volumes, on my Mandrake box it
works while it doesn't on RHEL4.

Hope this helps

Markus