[GRASS-user] Extract polygon in layer 1 with query on layer 2

[Ing. Pierluigi De Rosa]

Dear All,

I have shapefile with many topology errors. Most of there are
overlapping area.
When I'm import in GRASS It create, for all overlapped areas a link in
layer 2 and in layer 1 it create two category for each centroid.

It is possible extract only areas where each centroid are linked to only
one category or extract only areas where no link to layer 2 exist?


Thanks
Pierluigi

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Ing. Pierluigi De Rosa (PhD)
Studio Associato GFOSSERVICES
                
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skype: pierluigi.derosa