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man page of v.out.ogr

v.out.ogr: Converts to one of the supported OGR vector formats.


v.out.ogr - Converts to one of the supported OGR vector formats.
vector, export
v.out.ogr v.out.ogr help v.out.ogr [-uscep] input=name [type=string[,string,...]] dsn=string [olayer=string] [layer=integer] [format=string] [dsco=string[,string,...]] [lco=string[,string,...]] [--verbose] [--quiet] Flags: -u Open an existing datasource for update -s Skip export of GRASS category ID ('cat') attribute -c Export features with category (labeled) only. Otherwise all features are exported -e Use ESRI-style .prj file format (applies to Shapefile output only) -p Export lines as polygons --verbose Verbose module output --quiet Quiet module output Parameters: input=name Name of input vector map type=string[,string,...] Feature type. Combination of types is not supported by all formats. Options: point,line,boundary,centroid,area,face,kernel,auto Default: line,boundary dsn=string OGR output datasource name For example: ESRI Shapefile: filename or directory for storage olayer=string OGR layer name. If not specified, input name is used. For example: ESRI Shapefile: shapefile name layer=integer Layer number A single vector map can be connected to multiple database tables. This number determines which table to use. Default: 1 format=string OGR format Options: ESRI_Shapefile,MapInfo_File,TIGER,S57,DGN,Memory,BNA,CSV,GML,GPX,KML,GeoJSON,GMT,SQLite,ODBC,PostgreSQL,MySQL,Geoconcept Default: ESRI_Shapefile dsco=string[,string,...] OGR dataset creation option (format specific, NAME=VALUE) Default: lco=string[,string,...] OGR layer creation option (format specific, NAME=VALUE) Default:


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.


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


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 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 ...


OGR vector library OGR vector library C API documentation
db.out.ogr, v.external, v.in.ogr
Radim Blazek, ITC-Irst, Trento, Italy Some contributions: Markus Neteler, Martin Landa Last changed: $Date: 2010-04-04 13:21:23 +0200 (Sun, 04 Apr 2010) $ Full index (C) 2003-2010 GRASS Development Team V.OUT.OGR(1)

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