[GRASS-user] r.fillnulls for large area

Hamish hamish_b at yahoo.com
Thu Dec 1 16:16:45 EST 2011

Nick wrote:
> Thanks for the advice to fill the ocean with
> zeros. It worked better, and didn't get "killed",
> but it still didn't work...This time it made it
> further than before, but it got "abondoned" - see
> the output below...

try editing the r.fillnulls script, on line 165
replace "r.to.vect input=..." with
"r.to.vect -b input=...". I think it would work,
but I'm not sure if it would make it slower to run
v.surf.rst or not. (?)

> Maybe I need to split my region into subregions
> and run r.fillnulls on each subregion then patch
> them together.

yes, that should work well.

> Number of nodes: 13428068

building topology for anything more that 3-5 million
cells will consume a large amount of memory due to
the cumulative effect of the small, but real,
memory requirement of each individual feature.
maybe if you had 16gb RAM 13 million would be ok?


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