Hi - I'm trying to do something I thought was fairly simple, but eludes me...
I'm trying to find the average elevation of polygons. I used gdal_rasterize to make a layer, which does indeed have unique categories, and values, for each building. I'm trying to use this layer against a DEM, and on a per-polygon basis, get the min/max of the DEM ... I was thinking that somehow I might use r.statistics, but....not so straightforward, apparently. thanks in advance for any suggestions! Chris p.s. - it would sure be nice if I could make key/value pairs within mapcalc; that way I could read a category from one layer, make a key, and fetch it anywhere within mapcalc... _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
