v.what(1grass) GRASS GIS User's Manual v.what(1grass)
NAME
v.what - Queries a vector map at given locations.
KEYWORDS
vector, querying, position
SYNOPSIS
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]
Flags:
-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
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-speci-
fied 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
SOURCE CODE
Available at: v.what source code (history)
Accessed: unknown
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GRASS 7.8.7 v.what(1grass)
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