v.out.ogr(1)

NAME
v.out.ogr

DESCRIPTION
v.out.ogr converts GRASS vector data to OGR format. OGR (Simple Features Library) is part of the GDAL library, so you need to install gdal to use v.out.ogr.

  Supported OGR Vector Formats
ESRI Shapefile
CSV
GML
KML
Mapinfo File
PostgreSQL/PostGIS
TIGER

For further available drivers go here.

NOTES
To export areas with holes into, e.g., a Shapefile, while keeping the holes as holes, the flag -c has to be used.

The "-z" flag can be used to automatically export a 3D map to a 3D Shapefile, instead of setting the correct lco= option manually.

EXAMPLES

  Export to Shapefile
Export lines from GRASS vector map to Shapefile format:
v.out.ogr input=lines type=line dsn=lines.shp

Export areas from GRASS vector map to Shapefile format, preserving islands:
v.out.ogr -c input=areas_islands type=area dsn=areas_islands.shp

Export 3D lines from GRASS vector map to Shapefile format:
v.out.ogr input=lines_3d type=line dsn=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 dsn=points_3d.shp lco="SHPT=POINTZ"

Export 3D faces from GRASS vector map to Shapefile format:
v.out.ogr input=objects_3d type=face dsn=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 dsn=faces_3d.shp -z"

  Export to GML
Export lines from GRASS vector map to GML format (generates /tmp/testogr.gml file with layer 'testogr'):
v.out.ogr input=multi type=line dsn=/tmp/testogr.gml olayer=testogr format=GML

  Export to PostgreSQL/PostGIS
Export areas from GRASS vector map directly to PostGIS:
v.out.ogr input=polygons type=area \
          dsn="PG:host=localhost dbname=postgis user=postgres" \
          olayer=polymap format=PostgreSQL

  Export to KML (Google Earth)
Example 1 (Latitude-Longitude location):
Export faces (3D vectors) from GRASS vector map to KML format for Google Earth:
v.out.ogr input=buildings_3d dsn=buildings_3d.kml olayer=buildings_3d \
          format=KML type=face

Example 2 (Latitude-Longitude location):
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 dsn=random3d_hull.kml format=KML \
          type=face dsco="AltitudeMode=absolute"
# now open KML file 'random3d_hull.kml' in Google Earth or NASA WorldWind or ...

REFERENCES
OGR vector library
OGR vector library C API documentation

SEE ALSO
db.out.ogr, v.external, v.in.ogr

AUTHORS
Radim Blazek, ITC-Irst, Trento, Italy
Some contributions: Markus Neteler, Martin Landa

Last changed: $Date: 2011-11-08 12:29:50 +0100 (Tue, 08 Nov 2011) $

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