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Man Pages Grass User's Manual - Reports geometry statistics for vector maps.

vector, geometry, statistics --help map=name [layer=string] option= string [units=string] [sort=string] [-- help] [--verbose] [--quiet] [-- ui]

Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog

map=name [required]
Name of vector map
Or data source for direct OGR access
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
option=string [required]
Value to calculate
Options: area, length, coor
Options: miles, feet, meters, kilometers, acres, hectares, percent
Sort the result
Options: asc, desc
asc: Sort in ascending order
desc: Sort in descending order generates a table showing the area present in each of the categories of a user-selected data layer.
Area is given in hectares, square meters, and square kilometers. If the units option is used, area is given in acres, square feet, and square miles.
Feet and acre units are always reported in their common versions (i.e. the International Foot, exactly 5280 feet in a mile), even when the location’s standard map unit is the US Survey foot. works on the full map data; therefore, the current region is ignored. If you wish to spatially limit the statistics, a map subset must be created with and v.overlay, and then run on the new map.

North Carolina sample dataset: zipcodes_wake option=area units=hectares
In the output, there is an extra column added containing the results.,, v.overlay

Markus Neteler, GDF Hannover
Last changed: $Date: 2011-11-08 22:24:20 +0100 (Tue, 08 Nov 2011) $

Available at: source code (history)
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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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