[GRASS-user] r.neighbour and r.mask

achim ak7 at jupiter.uni-freiburg.de
Tue Jul 7 04:51:25 EDT 2009

Hallo Milton,

Yes, it should be faster. (You could write a script with timestamps and
test on a small area how much faster it would be)

> If I use r.mask, it means that when I run
> r.neighbours the
> processing will be faster than when I not set r.mask (supposing that the
> north, south, west and east
> will be the same on both case)? 

But be aware of filters that involve NULL values in there window. That
could cause NULLs where weren't before.

To be sure, write the filters manually with r.mapcalc and handle NULLs
as you like.

Best wishes,

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