Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
OGR (Simple Features Library) is part of the GDAL library, so you need to install this library to use v.out.ogr.
The OGR library supports many various formats including:
For further available other supported formats go here.
v.out.ogr exports 3D vector data as 2.5D simple features if possible (not supported by all formats). For exporting 3D vector data as 2D simple features, use -2 flag.
By default, v.out.ogr converts GRASS vector data to single simple features. If GRASS feature has more categories defined in the given layer, then this feature is exported multiple times. GRASS features without category are skipped by default. To export features also without category, the -c flag must be given.
When -m flag is given, v.out.ogr export GRASS vector data as multi-features. Multi-feature is formed by GRASS features with the same category. When -c flag is given, the module also export GRASS features without category as one multi-feature. Note that multi-features are not supported by all formats.
ESRI Shapefile export: note that due to the DBF table specifications column names may not be longer than 10 characters.
Performance: export to SQLite based formats including OGC GeoPackage may become faster with the environmental variable OGR_SQLITE_CACHE=1024 being set (value depends on available RAM, see OGR ConfigOptions).
v.out.ogr input=roadsmajor type=line output=roadsmajor.gpkg
Export areas from GRASS vector map to OGC GeoPackage format, converting islands (holes) to filled polygons:
v.out.ogr -c input=areas_islands type=area output=areas_islands.gpkg
Export mixed geometry type GRASS vector map to OGC GeoPackage format:
v.out.ogr input=generic_vector output=mixed_geometry.gpkg
v.out.ogr input=roadsmajor type=line format=ESRI_Shapefile output=lines.shp
Export areas from GRASS vector map to Shapefile format, converting islands (holes) to filled polygons:
v.out.ogr -c input=areas_islands type=area format=ESRI_Shapefile output=areas_islands.shp
Export 3D lines from GRASS vector map to Shapefile format:
v.out.ogr input=lines_3d type=line format=ESRI_Shapefile output=lines_3d.shp lco="SHPT=ARCZ"
Export 3D points (e.g., Lidar points) from GRASS vector map to Shapefile format
v.out.ogr points_3d type=point format=ESRI_Shapefile output=points_3d.shp lco="SHPT=POINTZ"
Export 3D faces from GRASS vector map to Shapefile format:
v.out.ogr input=objects_3d type=face format=ESRI_Shapefile output=faces_3d.shp lco="SHPT=POLYGONZ"
Export 3D faces from GRASS vector map to Shapefile format, automatic 3D setting:
v.out.ogr input=objects_3d type=face format=ESRI_Shapefile output=faces_3d.shp"
v.out.ogr input=multi type=line output=/tmp/testogr.gml output_layer=testogr format=GML
v.out.ogr input=polygons type=area output="PG:host=localhost dbname=postgis user=postgres" output_layer=polymap format=PostgreSQL
Export faces (3D vectors) from GRASS vector map to KML format for Google Earth:
v.out.ogr input=buildings_3d output=buildings_3d.kml output_layer=buildings_3d format=KML type=face
Generate and export GRASS vector "asteroid" map (faces, 3D vectors) to KML format for Google Earth:
# near Raleigh (NC, USA) g.region n=35.73952587 s=35.73279182 w=-78.68263928 e=-78.67499517 # two layers of random points v.random -z output=random3d_a n=10 zmin=0 zmax=200 v.random -z output=random3d_b n=15 zmin=400 zmax=600 # merge into one 3D points map v.patch input=random3d_a,random3d_b output=random3d # generate 3D convex hull v.hull input=random3d output="random3d_hull" # export to KML 3D v.out.ogr input=random3d_hull output=random3d_hull.kml format=KML type=face dsco="AltitudeMode=absolute" # now open KML file 'random3d_hull.kml' in Google Earth or NASA WorldWind or ...
Available at: v.out.ogr source code (history)
Latest change: Wed May 5 11:09:00 2021 in commit: 90825bb390dc789f58abdfa55481b928f9b249fb
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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