table of contents
| 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]
[columns=name[,name,...]] [--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 - columns=name[,name,...]
-
Name of attribute column(s)
Default: all columns
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
SOURCE CODE¶
Available at: v.what source code (history)
Accessed: Saturday Jul 27 17:08:55 2024
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