Michael Barton wrote: > > I'm having problems getting a MASK to actually mask anything. > > > > $ r.mask in=Diff_Nov2007_Oct2007_1m > > MASK created. All subsequent raster operations > > will be limited to MASK area > > Removing or renaming raster file named MASK will > > restore raster operations to normal > > [Raster MASK present] > > > > Yet all refreshes of the gis.m map display window do not clip the > > display extents > > based on the new mask(see attached png). In the screenshot, the > > mask is the pink raster, > > and underneath it is another raster in my mapset. Shouldn't the > > underlying raster's display > > be clipped to that of the mask? > > > > Using r.mapcalc while the mask exists also doesn't seem to obey the > > extents of the mask, i.e.: > > > > r.mapcalc test = 'Diff_Oct2007_Mar2007_1m' > > > > This creates the raster 'test' with data extents that match > > Diff_Oct2007_Mar2007_1m, not the mask's > > boundaries. > > > > I'm using svn-trunk compiled from today's source. > > > > ~ Eric. > > > Eric, > > The way I understand it is that a MASK will affect all subsequent > *read* operations for processing a raster map.
Correct. > That is... > > r.mapcalc 'newmap=oldmap' > > ...will just produce an unaltered copy of oldmap without a MASK; with > a MASK it will produce a copy of oldmap only in the area of MASK. > > MASK will not affect the display. It is for map processing. As you've already noticed, MASK *will* affect the display. You can't display a map without reading it, and MASK affects all raster read operations unless they explicitly choose to avoid it by using the G_get_*_row_nomask() functions. FWIW, the following modules use the G_get_*_row_nomask() functions: imagery/i.class imagery/i.ortho.photo imagery/i.points imagery/i.rectify imagery/i.vpoints ps/ps.map raster/r.basins.fill raster/r.buffer raster/r.cats raster/r.compress raster/r.describe raster/r.le raster/r.null raster/r.random.cells raster/r.random.surface raster/r.recode raster/r.rescale raster/r.slope.aspect raster/r.support.stats raster/r.surf.contour raster/r.surf.idw raster/r.surf.idw2 raster/r.watershed -- Glynn Clements <[EMAIL PROTECTED]> _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
