v.db.droprow(1grass) | GRASS GIS User's Manual | v.db.droprow(1grass) |
v.db.droprow - Removes a vector feature from a vector map through attribute selection.
vector, attribute table, database
v.db.droprow
v.db.droprow --help
v.db.droprow input=name [layer=string]
where=sql_query output=name [--overwrite]
[--help] [--verbose] [--quiet] [--ui]
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.
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.
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
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
GRASS SQL interface
Markus Neteler
Available at: v.db.droprow source code (history)
Accessed: Sunday Jan 22 07:37:44 2023
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