DESCRIPTION
v.db.droprow removes vector object(s) (point, line, area, face etc.)
from a vector map through attribute selection in the table connected
to the given vector map. It automatically checks the connection for the specified
layer.
NOTES
v.db.droprow is a front-end to v.extract (reverse selection)
to allow easier usage.
The existing database connection(s) can be verified with v.db.connect.
EXAMPLES
Dropping all vector points without elevation attribute (North Carolina data set):
g.region raster=elevation -p
v.random output=rand5k_elev n=5000
v.db.addtable map=rand5k_elev column="elevation double precision"
v.what.rast vect=rand5k_elev rast=elevation column=elevation
# verify absence of some elevation attributes ("number of NULL attributes"):
v.univar rand5k_elev type=point column=elevation
# Remove all vector points lacking elevation attribute
v.db.droprow rand5k_elev output=rand5k_elev_filt where="elevation IS NULL"
# verify:
v.univar rand5k_elev_filt type=point column=elevation
SEE ALSO
db.droptable,
db.execute,
v.db.addcolumn,
v.db.addtable,
v.db.connect,
v.db.dropcolumn,
v.db.droptable,
v.db.select,
v.db.update
AUTHOR
Markus Neteler
Last changed: $Date: 2014-12-19 22:55:37 +0100 (Fri, 19 Dec 2014) $