[GRASS-user] why v.patch -e produces cat column starting from 2?
Nikos Alexandris
nikos.alexandris at felis.uni-freiburg.de
Wed Nov 12 09:56:39 EST 2008
On Wed, 2008-11-12 at 15:50 +0100, Moritz Lennert wrote:
> On 12/11/08 15:05, Nikos Alexandris wrote:
> > On Wed, 2008-11-12 at 14:44 +0100, Nikos Alexandris wrote:
> >> On Wed, 2008-11-12 at 05:35 +0100, Nikos Alexandris wrote:
[...]
>
> There is a fundamental problem with '-a' if the cat numbers in the two
> maps are overlapping, but the attributes linked to these overlapping
> numbers are different in the two maps:
>
[...]
>
> => attributes 'ten' and 'twenty from map are gone since key fields have
> to be unique in attribute tables
>
> So, unless you are sure that there are not overlapping cat's in the maps
> you are planning to patch, steer away from '-a'.
>
> Moritz
OK, even more clear now.
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