table of contents
v.db.droprow(1grass) | GRASS GIS User's Manual | v.db.droprow(1grass) |
NAME¶
v.db.droprow - Removes a vector feature from a vector map through attribute selection.
KEYWORDS¶
vector, attribute table, database
SYNOPSIS¶
v.db.droprow
v.db.droprow --help
v.db.droprow input=name [layer=string]
where=sql_query output=name [--overwrite]
[--help] [--verbose] [--quiet] [--ui]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files - --help
-
Print usage summary - --verbose
-
Verbose module output - --quiet
-
Quiet module output - --ui
-
Force launching GUI dialog
Parameters:¶
- input=name [required]
-
Name of input vector map
Or data source for direct OGR access - layer=string
-
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
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
GRASS SQL interface
AUTHOR¶
Markus Neteler
SOURCE CODE¶
Available at: v.db.droprow source code (history)
Accessed: Saturday Jul 27 17:09:13 2024
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