Your company here — click to reach over 10,000 unique daily visitors

v.db.droprow.1grass - Man Page

Removes a vector feature from a vector map through attribute selection.


vector, attribute table, database


v.db.droprow --help
v.db.droprow input=name  [layer=string]  where=sql_query output=name  [--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]



Allow output files to overwrite existing files


Print usage summary


Verbose module output


Quiet module output


Force launching GUI dialog


input=name [required]

Name of input vector map
Or data source for direct OGR access


Layer number or name
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
Default: 1

where=sql_query [required]

WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000

output=name [required]

Name for output vector map


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

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

GRASS SQL interface


Markus Neteler

Source Code

Available at: v.db.droprow source code (history)

Accessed: Tuesday May 14 13:42:02 2024

Main index | Vector index | Topics index | Keywords index | Graphical index | Full index

© 2003-2024 GRASS Development Team, GRASS GIS 8.3.2 Reference Manual


GRASS 8.3.2 GRASS GIS User's Manual