[GRASS-user] summarize col A by col B

GRASS GRASS user
1

hi list!

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.

thanks for helping
martin

2

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