Rich Shepard wrote > On Thu, 8 Jun 2017, Helmut Kudrnovsky wrote: > >> raster A: >> raster B: raster eg with values 1 and 2 >> >> in R.mapcalc : >> >> if(B==1, A, A/B) >> >> which means in the resulting map: if the cell value in B is equal to 1, >> then >> take the raster cell value of raster A, otherwise divide the raster cell >> value of A by the raster cell value of B. > > Helmut, > > I understand this produces a new map from two maps with different > values. > My two raster maps have the same value (2) because they come from dividing > a > single vector map whose area has a single value. > > I'm trying various v.db.* modules to change values in the two vector > maps, > then I can recreate the vector maps from these and each will have the > desired value. So far no success, but I'll keep trying. > > Thanks, > > Rich > > _______________________________________________ > grass-user mailing list
> [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user https://grass.osgeo.org/grass73/manuals/v.db.update.html ? -Add e.g. a integer column to the vector - Insert 1 and 2 for the polygons in this column by v.db.update - V.to.rast by attributes - R.mapcalc ----- best regards Helmut -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Change-value-of-cells-in-raster-map-tp5323575p5323656.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
