[GRASS-dev] does r.composite respect a mask?

[Glynn Clements]

Michael Barton wrote:

> It is taking a VERY long time to run r.composite. It is a big map in
> its entirety. But only a part of the map falls within the MASK.
> 
> FWIW, I have the computational region set to match the MASK too.

r.composite doesn't do anything special with regard to the region or
mask.

A "sparse" map (with large null areas) should have some advantage over
a dense map, as the colour lookup optimises the case where a cell's
value matches the previous cell's value, and also checks for null
before other values.

-- 
Glynn Clements <glynn at gclements.plus.com>