[GRASS-user] Buffered categories

Richard Chirgwin rchirgwin at ozemail.com.au
Fri Feb 24 03:40:30 EST 2012



The handling of overlapping areas is the reason I keep recompiling the 
older version of v.buffer as v.oldbuffer. This lets me use the old debug 
flag to prevent it from cleaning the areas, which I can then turn into 
discrete areas instead of having them combined by the newer version. 
Which reminds me, since the latest upgrade ...


On 24/02/12 7:30 PM, Hamish wrote:
> Richard wrote:
>> rather than the 47 categories I need (because there are 47
>> distinct  areas in the buffer.
>> So: how do I reassign the cats so there are 47 instead of 1
>> in the buffer?
> # get rid of the old
> v.category type=centroid op=del
> # create some new sequential ones
> v.category type=centroid op=add cat=1 step=1
> (cat= is the number it starts counting from)
> if you need the cat to match the seed point, use v.distance as earlier
> suggested. and do beware of what becomes of overlapping areas.
> Hamish

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