Very nice! > b - The big problem are coastlines and waterbodies (+main rivers): > somehow I have to show them on the topographic map, which gdalwarp has > filled out with -32768 values in nodata-waterzones. So either I cut > waterbodies out of the topographic raster along the vectors, or I > somehow have GRASS compute me all waterbodies from the vector layer, When I understand right, its easy. In case of having all vectors as polygons, try "v.to.rast". Then you have a raster layer of desired resolution (set with g.region). > fill them with a nice blue and create a raster which can be pasted > over the topographic raster to get the final map. It seems doable > with mapcalc, but frankly, I do not know at all how to proceed. Any > help here would be greatly appreciated. When you want to overlay the topographic-map with water-information, be aware what you want to do: when you just want the information, that there is water, you are done with telling the new raster-layer to be blue and transparent. If you want to change the topology for calculation with r.watershed (e.g. river-burning) or flatten lake-regions or set topography on coast-lines to zero, it would be a bit more to do.
Cheers, Achim _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user