On 04/03/15 15:14, Pietro wrote:
Dear all,
I'm looking for a GRASS module that unify the geometries and the
values, If I have a configuration like:
geo features | cat | id | A | B
geofeature1 => cat1, id1, a1, b1
geofeature2 => cat2, id1, a2, b2
geofeature3 => cat3, id2, a3, b3
geofeature4 => cat4, id2, a4, b4
geofeature5 => cat5, id2, a5, b5
I would like to have something like:
SELECT id, mean(A) as meanA, mean(B) as meanB FROM table GROUP BY id;
geo features | cat | meanA | meanB
geo1, geo2 => id1, mean(a1, a2), mean(b1, b2)
geo3, geo4, geo5 => id2, mean(a3, a4, a5), mean(b3, b4, b5)
> There is already something to do this simple operation?
> Do you have any suggestions?
>
Does this mean you want to fusion the geofeatures (thus imlying that
they are adjacent) or do you want to group them in a sort of typology ?
If the first, then it should probably be possible to integrate this into
v.dissolve.
If the second, I could imagine a combination of v.reclass / v.category
to create a new/second layer and then your SQL query to populate the
table of that layer.
Moritz
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