GRASS GIS manual: v.info

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.4, available here.
Updated manual page: here

NAME

v.info - Outputs basic information about a vector map.

KEYWORDS

vector, metadata, topology, extent, history, attribute columns

SYNOPSIS

v.info

v.info --help

v.info [-hcget] map=name [layer=string] [--help] [--verbose] [--quiet] [--ui]

Flags:

-h: Print history instead of info and exit
-c: Print types/names of table columns for specified layer instead of info and exit
-g: Print region info in shell script style
-e: Print extended metadata info in shell script style
-t: Print topology info in shell script style
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Name of 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

DESCRIPTION
EXAMPLE
PYTHON
SEE ALSO
AUTHOR

DESCRIPTION

v.info reports some basic information (metadata) about a user-specified vector map and its topology status.

If topology info is not available (i.e., vector map cannot be open on level 2), vector map extends and number of features need to be counted on the fly which may take some time.

EXAMPLE

Basic metadata information

v.info map=geology

 +----------------------------------------------------------------------------+
 | Name:            geology                                                   |
 | Mapset:          PERMANENT                                                 |
 | Location:        nc_spm_08                                                 |
 | Database:        /home/martin/grassdata                                    |
 | Title:           North Carolina geology map (polygon map)                  |
 | Map scale:       1:1                                                       |
 | Map format:      native                                                    |
 | Name of creator: helena                                                    |
 | Organization:    NC OneMap                                                 |
 | Source date:     Mon Nov  6 15:48:53 2006                                  |
 |----------------------------------------------------------------------------|
 |   Type of map: vector (level: 2)                                           |
 |                                                                            |
 |   Number of points:       0               Number of centroids:  1832       |
 |   Number of lines:        0               Number of boundaries: 3649       |
 |   Number of areas:        1832            Number of islands:    907        |
 |                                                                            |
 |   Map is 3D:              No                                               |
 |   Number of dblinks:      1                                                |
 |                                                                            |
 |   Projection: Lambert Conformal Conic                                      |
 |                                                                            |
 |               N:   318117.43741634    S:    10875.82723209                 |
 |               E:   930172.31282271    W:   123971.19498978                 |
 |                                                                            |
 |   Digitization threshold: 0                                                |
 |   Comment:                                                                 |
 |                                                                            |
 +----------------------------------------------------------------------------+

Map history

v.info -h map=geology

COMMAND: v.in.ogr input="geol.shp" output="geology" min_area=0.0001 snap=-1
GISDBASE: /bigdata/grassdata05
LOCATION: ncfromfile MAPSET: PERMANENT USER: helena DATE: Mon Nov  6 15:48:53 2006
---------------------------------------------------------------------------------
1832 input polygons
total area: 1.276093e+11 (1832 areas)
overlapping area: 0.000000e+00 (0 areas)
area without category: 0.000000e+00 (0 areas)
---------------------------------------------------------------------------------

Attribute columns for given layer

v.info -c map=geology

Displaying column types/names for database connection of layer <1>:
INTEGER|cat
DOUBLE PRECISION|onemap_pro
DOUBLE PRECISION|PERIMETER
INTEGER|GEOL250_
INTEGER|GEOL250_ID
CHARACTER|GEO_NAME
DOUBLE PRECISION|SHAPE_area
DOUBLE PRECISION|SHAPE_len

Basic metadata information in shell script style

v.info -get map=geology 

name=geology
mapset=PERMANENT
location=nc_spm_08
database=/home/martin/grassdata
title=North Carolina geology map (polygon map)
scale=1:1
format=native
creator=helena
organization=NC OneMap
source_date=Mon Nov  6 15:48:53 2006
level=2
map3d=0
num_dblinks=1
projection=Lambert Conformal Conic
digitization_threshold=0.000000
comment=
north=318117.43741634
south=10875.82723209
east=930172.31282271
west=123971.19498978
top=0.000000
bottom=0.000000
nodes=4556
points=0
lines=0
boundaries=3649
centroids=1832
areas=1832
islands=907
primitives=5481

v.info -g map=geology

north=318117.43741634
south=10875.82723209
east=930172.31282271
west=123971.19498978
top=0.000000
bottom=0.000000

PYTHON

See Python Scripting Library for more info.

Note: The Python shell in the wxGUI can be used for entering the following code:

import grass.script as gcore
    
gcore.vector_columns('geology')   # for `v.info -c`
gcore.vector_info_topo('geology') # for `v.info shell=topo`

AUTHOR

Original author CERL
Updated to GRASS 6 by Radim Blazek, ITC-Irst, Trento, Italy
Level 1 support by Markus Metz
Updated to GRASS 7 by Martin Landa, CTU in Prague, Czech Republic

Last changed: $Date: 2014-12-09 09:31:29 -0800 (Tue, 09 Dec 2014) $

SOURCE CODE

Available at: v.info source code (history)