Stefan Eriksson wrote: > > > I am trying to create isoareas from DEM data. > > > So far I have managed to create the polygons from DEM data by > > >> r.mapcalc "newElev2 = round(elevation.dem / 100) * 100" > > > 100% > > >> r.to.vect
Moritz Lennert wrote: > > Have you tried r.contour ? Stefan Eriksson wrote: > Yes, but I want polygons rather than lines as output. r.contour only > produce lines, does it not? Convert lines to polygons with 'v.type line,boundary' and v.centroids. Areas in GRASS are virtual features made from boundaries + centroids. The centroid will typically hold the attribute data (like elevation range) and the boundary will not have a category (it is ambiguous as to which area touching the boundary belongs to the attribute. Note that many GRASS vector modules only work on features with category numbers, add/remove those with v.category. Hamish __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ grassuser mailing list grassuser@grass.itc.it http://grass.itc.it/mailman/listinfo/grassuser