[GRASS-user] reclass -> multipolygon?

achim ak7 at jupiter.uni-freiburg.de
Wed Sep 23 08:42:48 EDT 2009


Well, I really stuck here:

I havent found anything about playing with the common geom multipolygon
in GRASS. I think that is what I need and what I thought I could handle
with v.reclass. But it does not work.

-Is there something in GRASS to create multipolygons?
-Do they have one centroid or multiple with the same cat (as I thought)

Any suggestions are very welcome
achim

achim schrieb:
>> PS:
>> workaround would be:
>> v.to.rast with old values
>> update centros of reclassed map from that raster map
>> -> but it seems a bit in-elegant..
> ...and which is a bit complicated as centroids cannot be used in
> v.what.rast...
> ...and conversion into points produces more than one point for some
> centroids (where one cat has more than two separate areas), so
> v.what.rast produces NULLs here...
> 
> -so the workaround isn't one-
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