Re: [GRASS-user] DEM resolution from r.surf.contour
On Wed, May 4, 2011 at 10:48 AM, Hanlie Pretorius hanlie.pretor...@gmail.com wrote: Hi, I'd like to ask a question related to another question I was asking recently about converting contour vectors to rasters and creating a DEM from the raster contours using r.surf.contour. My supplied vector contour layer has 20m intervals between contour lines. When I convert this to raster, the smallest region resolution I can use is 5m, otherwise v.to.rast runs out of memory. Please post - GRASS version/OS - g.region -p output to better understand the problem. Markus When I use r.surf.contour to create the DEM from the raster, which region resolution makes sense then? I set it to 20m because of the contour interval, but I'm starting to think that's not the best option because the interpolation between two contour lines should be as fine as possible. Any thoughts? Thanks Hanlie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] DEM resolution from r.surf.contour
GRASS 6.4.1 on Windows XP. g.region output for 5m resolution: g.region -p vect=contours_20m@PERMANENT nsres=5 ewres=5 projection: 99 (Transverse Mercator) zone: 0 datum: ** unknown (default: WGS84) ** ellipsoid: wgs84 north: -3121229.69982072 south: -3156672.30728643 west: -67483.27873573 east: -32474.90929218 nsres: 4.9996625 ewres: 4.99976713 rows: 7089 cols: 7002 cells: 49637178 g.region output for 20m resolution: g.region -p vect=contours_20m@PERMANENT nsres=20 ewres=20 projection: 99 (Transverse Mercator) zone: 0 datum: ** unknown (default: WGS84) ** ellipsoid: wgs84 north: -3121229.69982072 south: -3156672.30728643 west: -67483.27873573 east: -32474.90929218 nsres: 20.00147148 ewres: 20.00478254 rows: 1772 cols: 1750 cells: 3101000 Thanks Hanlie 2011/5/6, Markus Neteler nete...@osgeo.org: On Wed, May 4, 2011 at 10:48 AM, Hanlie Pretorius hanlie.pretor...@gmail.com wrote: Hi, I'd like to ask a question related to another question I was asking recently about converting contour vectors to rasters and creating a DEM from the raster contours using r.surf.contour. My supplied vector contour layer has 20m intervals between contour lines. When I convert this to raster, the smallest region resolution I can use is 5m, otherwise v.to.rast runs out of memory. Please post - GRASS version/OS - g.region -p output to better understand the problem. Markus When I use r.surf.contour to create the DEM from the raster, which region resolution makes sense then? I set it to 20m because of the contour interval, but I'm starting to think that's not the best option because the interpolation between two contour lines should be as fine as possible. Any thoughts? Thanks Hanlie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] DEM resolution from r.surf.contour
Hi, I'd like to ask a question related to another question I was asking recently about converting contour vectors to rasters and creating a DEM from the raster contours using r.surf.contour. My supplied vector contour layer has 20m intervals between contour lines. When I convert this to raster, the smallest region resolution I can use is 5m, otherwise v.to.rast runs out of memory. When I use r.surf.contour to create the DEM from the raster, which region resolution makes sense then? I set it to 20m because of the contour interval, but I'm starting to think that's not the best option because the interpolation between two contour lines should be as fine as possible. Any thoughts? Thanks Hanlie ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
