[GRASS-dev] finding the hole of a donut

[Hamish]

Michael Barton wrote:
> I have a vector shape with some complexly shaped empty areas inside. 
> I'd like to somehow extract these empty areas--eventually as a  
> raster. I want to use these interior empty space to make that part of
> a raster null.
> 
> It's kind of like wanting to extract the hole of a donut but NOT get 
> the area outside the donut too.
> 
> Any suggestions as to how to go about this?


v.centroids + v.dissolve to remove holes, then run v.overlayfor  holes
filled version versus original op=not?


Hamish



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