v.what.1grass man page

v.what — Queries a vector map at given locations.

Keywords

vector, querying, position

Synopsis

v.what
v.what --help
v.what [-dagj] map=name[,name,...] [layer=string[,string,...]] [type=string[,string,...]] coordinates=east,north [distance=float] [--help] [--verbose] [--quiet] [--ui]

Flags

-d
Print topological information (debugging)
-a
Print attribute information
-g
Print the stats in shell script style
-j
Print the stats in JSON
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog

Parameters

map=name[,name,...] [required]
Name of vector map(s)
layer=string[,string,...]
Layer number or name (’-1’ for all layers)
A single vector map can be connected to multiple database tables. This number determines which table to use. When used with direct OGR access this is the layer name.
Default: -1
type=string[,string,...]
Input feature type
Options: point, line, boundary, centroid, area, face, kernel
Default: point,line,area,face
coordinates=east,north [required]
Coordinates for query
’-’ for standard input
distance=float
Query threshold distance
Default: 0

Description

v.what outputs the category number value(s) associated with user-specified location(s) in user-specified vector map layer(s). This module was derived from the d.what.vect module by removing all interactive code and modification of the output for easy parsing. Using the -g flag generates script-style output which is easily parsable.

Example

North Carolina sample dataset example:

Query polygon at given position:

v.what zipcodes_wake coordinates=637502.25,221744.25

Find closest hospital to given position within given distance (search radius):

v.what hospitals coordinates=542690.4,204802.7 distance=2000000

See Also

d.what.rast, d.what.vect, v.rast.stats, v.vect.stats, v.what.rast, v.what.rast3, v.what.vect

Author

Trevor Wiens
Edmonton, Alberta, Canada

Last changed: $Date: 2014-10-22 12:22:05 +0200 (Wed, 22 Oct 2014) $

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