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Man Pages
v.what(1) Grass User's Manual v.what(1)

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

vector, querying, position

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

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

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

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.

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

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

Trevor Wiens
 
Edmonton, Alberta, Canada
Last changed: $Date: 2014-10-22 12:22:22 +0200 (Wed, 22 Oct 2014) $

Available at: v.what source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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