On 08/14/2012 08:36 PM, Pedro Camargo wrote:
Hi, I downloaded a small section of the 2011 landcover layer from the site you linked to. In the download options, I specified WGS84 Lat/Lon coordinate system. (Otherwise is was projected in an unknown, but specified Albers Equal Area CRS). Then I imported the raster into a Lat/Lon WGS84 LOCATION in GRASS using: r.in.gdal. No problem here: r.in.gdal in=NASS....tif out=nass # Or in the GUI, File->Import raster->Common import formats g.region -p rast=nass # Settings->Region->Set Region->Set to raster Next I did r.to.vect with the parameter "feature=area". This indeed created a polygon vector map: r.to.vect in=nass out=nass feature=area # In the GUI, File->Map type conversions->Raster to vector However you need to be aware that the raster will be come many tens of thousands of small polygons. I downloaded a small section of MA and it was about 1000 columns X 500 rows. A 500,000 cell raster is not large. But, converted to a vector this became 77,000 little polygons. So the procedure works. The question is: Is that what you want? What's your next step? Thanks, |
_______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
