[GRASS-dev] bug in v.surf.bspline?

[Hamish]

Michael Barton wrote:

> Also, in both cases the interpolation does not respect a MASK.


It is not expected to. The MASK is put into action only when *reading* a raster
map, not when creating/writing one.


e.g.
r.mapcalc MASK=fields
r.mapcalc one=1
g.remove MASK
r.univar one
# look, no NULL cells

r.mapcalc MASK=fields
r.mapcalc one_masked=one
g.remove MASK
r.univar one_masked
# lots of null cells, as the "one" map was masked while being read


If you don't remove MASK, r.univar (libgis) adds in nulls when it reads the
maps.


Hamish


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