[GRASS-user] cut raster
Hi everybody! http://www.dict.cc/englisch-deutsch/Hi+everybody.html I'm a beginner with GRASS... I have a lot of questions. Now I need to cut out an area from a satellite image according a relevant vector object from digital map. I need to cut out a building from satellite image, that I have as a vector object, and save it to the new raster map (only one building). Or may be it's possible to cut out an area from a satellite image using coordinates from vector object. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] cut raster
Hi Sofina, The way I normally do this is first, convert the vetor to raster (v.to.rast). Then I transform the converted newlly created raster to a mask (r.mask) and, using r.mapcalc, clip the satellite image. Don't forget to latter remove the raster mask. The commands performed would be something like this: v.to.rast input=building_vector output=build_raster r.mask build_raster r.mapcalc clipped_sat = satellite_image r.mask -r @ Grass List. I can't recall if there is an easier way to do this... Maybe a script? Such a simple procedure should be done easily in one step... Cheers Daniel On Thu, Oct 14, 2010 at 10:16 AM, Sofina Natalia nsof...@gmx.de wrote: Hi everybody! I'm a beginner with GRASS... I have a lot of questions. Now I need to cut out an area from a satellite image according a relevant vector object from digital map. I need to cut out a building from satellite image, that I have as a vector object, and save it to the new raster map (only one building). Or may be it's possible to cut out an area from a satellite image using coordinates from vector object. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] cut raster
Daniel Victoria wrote: Hi Sofina, The way I normally do this is first, convert the vetor to raster (v.to.rast). Then I transform the converted newlly created raster to a mask (r.mask) and, using r.mapcalc, clip the satellite image. Don't forget to latter remove the raster mask. The commands performed would be something like this: I would add some g.region commands: # set region to extends and grid cell geometry of satellite raster g.region rast=satellite_image v.to.rast input=building_vector output=build_raster # reduce region to non-NULL part of build_raster to reduce clipped raster size g.region zoom=build_raster r.mask build_raster r.mapcalc clipped_sat = satellite_image r.mask -r Markus M @ Grass List. I can't recall if there is an easier way to do this... Maybe a script? Such a simple procedure should be done easily in one step... Cheers Daniel On Thu, Oct 14, 2010 at 10:16 AM, Sofina Natalia nsof...@gmx.de wrote: Hi everybody! I'm a beginner with GRASS... I have a lot of questions. Now I need to cut out an area from a satellite image according a relevant vector object from digital map. I need to cut out a building from satellite image, that I have as a vector object, and save it to the new raster map (only one building). Or may be it's possible to cut out an area from a satellite image using coordinates from vector object. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
