Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2014-01-02 Thread Markus Neteler
On Fri, Dec 13, 2013 at 4:47 PM, Micha Silver mi...@arava.co.il wrote: As far as I know, the shapefile format does not really support 3D vectors. To my knowledge you can write out the 3D SHAPE file right away: http://grass.osgeo.org/grass64/manuals/v.out.ogr.html -z Create 3D output if input is

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-16 Thread image
Hello, Sorry to disturb you again. But when i type the command, i have an error message saying : The file is not found. Please see below the SS. It's strange beacause settings seems ok (location, mpaset,db). http://osgeo-org.1560.x6.nabble.com/file/n5094409/SS_errormessage.jpg -- View

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread image
Hello, Thank you very much for your reply. I made some tests following your recommandations. For information, the surface of my raw raster DEM is 15.000 km². Resolution : 1 pixel X pixel Y = 30 meters. (SRID 2154 UTM). 1/r.watershed: the main input parameter seems to be the minimum size for

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread Micha Silver
Hi On 12/13/2013 01:14 PM, image wrote: Hello, Thank you very much for your reply. I made some tests following your recommandations. For information, the surface of my raw raster DEM is 15.000 km². Resolution : 1 pixel X pixel Y = 30 meters. (SRID 2154

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread image
Hello, And thank you again for your help. I have a last little question. I succeed in generating with grass vector 3D. I would like now export it to shapefile3D. Do you know how to do that? Thanks. -- View this message in context:

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread Micha Silver
As far as I know, the shapefile format does not really support 3D vectors. On 12/13/2013 05:41 PM, image wrote: Hello, And thank you again for your help. I have a last little question. I succeed in generating with grass vector 3D. I would like now

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread image
Ok thanks. And acording to you, is it possible to add the field HeightZ to my vector3D Grass generated? Thanks? -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Extraction-3D-vectors-ridges-Thalweg-from-raster-DEM-tp5093957p5094181.html Sent from the Grass - Users

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-13 Thread Micha Silver
On 12/13/2013 06:33 PM, image wrote: Ok thanks. And acording to you, is it possible to add the field HeightZ to my vector3D Grass generated? Yes, you do this as follows: v.db.addcol map=your vector map columns="x_coord double precision, y_coord

[GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-12 Thread image
Dear all, From my Raster DEM, i would like extract Thalweg and Drainage divide (ridges) 's 3D vectors. According to you, is it possible to do that with grass? In advance, Thank you. Regards. -- View this message in context:

Re: [GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

2013-12-12 Thread Micha Silver
On 12/12/2013 15:47, image wrote: Dear all, From my Raster DEM, i would like extract Thalweg and Drainage divide (ridges) 's 3D vectors. According to you, is it possible to do that with grass? Certainly First use the r.watershed module to create streams and basins (rasters) from your DEM.