Moritz Lennert wrote: > >> r.grow.distance creates a distance map from each point, but > >> there is no way of telling it anything about null cells or > >> barriers. Even when setting a mask, r.grow.distance fills in > >> the whole region, which seems like a bug to me. > > > > > > perhaps if you invert the map? > > > > > > ie put starting point in null space and it will grow until/around cells > > with value? > > You mean invert the mask, so that land masses are nulls and water > non-nulls ? > > Doesn't work. > > r.grow.distance just seems to ignore the mask. Glynn ?
As I wrote in this thread on grass-user: > A mask just forces some input cells to be null. As a general > principle, modules don't distinguish between cells which are null in > the map itself and those which are null due to the mask. > > In any case, the specific purpose of r.grow.distance is: > > r.grow.distance generates a raster map representing the distance to > the nearest non-null cell in the input map. IOW, the mask just makes some input cells "disappear". -- Glynn Clements <[EMAIL PROTECTED]> _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
