[GRASS-user] summarize col A by col B

[Hamish]

Martin Rutzinger wrote:

> i have a grass vector layer with a connected attribute table (dbf)
> containing cats of neighbours and area values. i wonder if it is
> possilbe to summarize/union this vector by the cats in the attribute
> table, so that it is possile to calculate the sum area per each cat.

see

v.report (GRASS 6.1-cvs only)
v.to.db
v.db.select
db.select


for actual union, etc, use v.overlay &/or 'v.extract -d'


Hamish