[GRASS-user] Enclose the polygons within 50 metres

Hamish hamish_b at yahoo.com
Wed Jun 18 04:41:09 EDT 2008

Gabriele wrote:
> Indeed this was doing. I made the buffer (but on many
> polygons gives a bit of problems)

v.buffer can have some errors. It is currently being rewritten and we should have something better in place by the end of the summer.

Before then, and if you are converting to raster anyway, you might try the r.buffer module. it is much healthier.

> and now , as suggested by you, I can go to raster with
> v.to.rast. Or should I try to dissolve the buffer by working
> again with the vector.

I don't remember if it was suggested before, but you could convert back to vector and run v.clean with the remove small areas tool so only big blobs remain.

another idea is to buffer around individual buildings with an output buffer value of 1, then use r.series to add all the buffer areas together so overlap areas are equal 2,3,4,.. then r.grow or use 'r.neighbors maximum' to somehow extract/flood fill areas containing overlap.   ?



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