Vector donuts, how are they represented?

Chris W Skelly gewcs at
Mon Oct 18 00:44:12 EDT 1993

Peter Briggs writes,

> Listers,  Can somebody tell me how the v.out/in.ascii format
> would describe a polygon with a smaller polygon wholly inside it,
> where the smaller polygon (the hole) has a different category
> than the larger polygon (the donut)?  I want to get the area of
> the donut to not include the hole, and for both to be separate
> polygons with separate categories. 
> For that matter, I'd like to know how arc/info does it in 
> whatever way is compatible with

Can't we get you to use the raster environment -- life
would be so much easier ;-)


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