v.import.1grass man page

v.import — Imports vector data into a GRASS vector map using OGR library and reprojects on the fly.


vector, import, projection


v.import --help
v.import [-flo] input=name [layer=string[,string,...]] [output=name] [extent=string] [encoding=string] [snap=float] [epsg=integer] [datum_trans=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]


List supported OGR formats and exit
List available OGR layers in data source and exit
Override projection check (use current location’s projection)
Assume that the dataset has same projection as the current location
Allow output files to overwrite existing files
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


input=name [required]
Name of OGR datasource to be imported
OGR layer name. If not given, all available layers are imported
Name for output vector map (default: input)
Output vector map extent
Options: input, region
Default: input
input: extent of input map
region: extent of current region
Encoding value for attribute data
Snapping threshold for boundaries (map units)
’-1’ for no snap
Default: 1e-13
EPSG projection code
Options: 1-1000000
Index number of datum transform parameters
-1 to list available datum transform parameters
Options: -1-100


v.import imports selected layers from a OGR vector datasource into the current location and mapset. If the projection of the input does not match the projection of the location, the input is reprojected into the current location. If the projection of the input does match the projection of the location, the input is imported directly with v.in.ogr.


Topology cleaning

When importing polygons, non-topological polygons are converted to topological areas. By default, a very small snapping threshold is applied (1e-13 map units) to avoid topological errors caused by numerical inaccuracy of the input data format. If the original polygons contain errors (unexpected overlapping areas or small gaps between polygons), the import might need to be repeated using a larger snap value.


# import SHAPE file at full extent and reproject to current location projection
v.import input=research_area.shp output=research_area extent=input

See Also

v.in.ogr, v.proj


Markus Metz
Improvements: Martin Landa, Anna Petrasova

Last changed: $Date: 2015-01-20 20:52:27 +0100 (Tue, 20 Jan 2015) $

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