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NAME

       v.out.ogr  - Exports a vector map layer to any of the supported OGR vector formats.
       By default a vector map layer is exported to OGC GeoPackage format.

KEYWORDS

       vector, export, OGR

SYNOPSIS

       v.out.ogr
       v.out.ogr --help
       v.out.ogr    [-uasce2mnl]    input=name     [layer=string]      [type=string[,string,...]]
       output=name   format=string    [output_layer=string]     [output_type=string[,string,...]]
       [dsco=string[,string,...]]       [lco=string[,string,...]]      [--overwrite]     [--help]
       [--verbose]  [--quiet]  [--ui]

   Flags:
       -u
           Open an existing OGR datasource for update

       -a
           Append to existing layer
           A new OGR layer is created if it does not exist

       -s
           Skip export of GRASS category ID (’cat’) attribute

       -c
           Also export features without category (not  labeled).  Otherwise  only  features  with
           category are exported.

       -e
           Use ESRI-style .prj file format (applies to Shapefile output only)

       -2
           Force 2D output even if input is 3D (applies to Shapefile output only)
           Useful if input is 3D but all z coordinates are identical

       -m
           Export vector data as multi-features

       -n
           Create  a  new  empty  layer  in defined OGR datasource and exit. Nothing is read from
           input.

       -l
           List supported output formats and exit

       --overwrite
           Allow output files to overwrite existing files

       --help
           Print usage summary

       --verbose
           Verbose module output

       --quiet
           Quiet module output

       --ui
           Force launching GUI dialog

   Parameters:
       input=name [required]
           Name of input vector map to export
           Or data source for direct OGR access

       layer=string
           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

       type=string[,string,...]
           Feature type(s)
           Combination  of  types is not supported by all output formats. Default is to use first
           type found in input vector map.
           Options: point, line, boundary, centroid, area, face, kernel, auto
           Default: auto

       output=name [required]
           Name of output OGR datasource
           For example: ESRI Shapefile: filename or directory for storage
           PostGIS database: connection string

       format=string [required]
           Data format to write
           Options: AmigoCloud, BNA, CSV, Carto, Cloudant,  CouchDB,  DGN,  DXF,  ESRI_Shapefile,
           ElasticSearch,   GFT,   GML,  GMLAS,  GPKG,  GPSBabel,  GPSTrackMaker,  GPX,  GeoJSON,
           GeoJSONSeq, GeoRSS, Geoconcept, Interlis_1, Interlis_2, JML, JP2OpenJPEG, KML, LIBKML,
           MBTiles,  MSSQLSpatial,  MVT,  MapInfo_File,  Memory,  MySQL, NGW, ODBC, ODS, OGR_GMT,
           PCIDSK, PDF, PGDUMP, PostgreSQL, S57, SQLite, Selafin, TIGER, VDV, WAsP, XLSX, netCDF
           Default: GPKG

       output_layer=string
           Name for output OGR layer. If not specified, input name is used
           For example: ESRI Shapefile: shapefile name
           PostGIS database: table name

       output_type=string[,string,...]
           Optionally change default output type
           Options: line, boundary
           Default:
           line: export area boundaries as linestrings
           boundary: export lines as polygons

       dsco=string[,string,...]
           OGR dataset creation option (format specific, NAME=VALUE)
           Default:

       lco=string[,string,...]
           OGR layer creation option (format specific, NAME=VALUE)
           Default:

DESCRIPTION

       v.out.ogr converts GRASS vector map layer to any  of  the  supported  OGR  vector  formats
       (including OGC GeoPackage, ESRI Shapefile, SpatiaLite or GML).

       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:

           ·   OGC GeoPackage

           ·   ESRI Shapefile

           ·   PostGIS

           ·   SpatiaLite

           ·   CSV

           ·   GML

           ·   KML

           ·   Mapinfo File

           ·   TIGER

           ·   ... and many others
       The list of supported formats is printed with the -l flag.

       For further available other supported formats go here.

NOTES

       By default, islands will appear as holes inside surrounding areas. To export polygons with
       holes into, e.g., a Esri Shapefile, and make the holes appear as filled areas, the flag -c
       has to be used.

       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.

EXAMPLES

   Export to OGC GeoPackage
       Export lines from a GRASS vector map to OGC GeoPackage format:
       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

   Export to ESRI Shapefile
       Export lines from GRASS vector map to Shapefile format:
       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"

   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 output=/tmp/testogr.gml output_layer=testogr format=GML

   Export to PostgreSQL/PostGIS
       Export areas from GRASS vector map to PostGIS database:
       v.out.ogr input=polygons type=area output="PG:host=localhost dbname=postgis user=postgres" output_layer=polymap format=PostgreSQL
       Note:  For  exporting GRASS vector data to PostGIS database can be also used v.out.postgis
       module. This module is not based on OGR library and supports beside simple  features  also
       topological format (PostGIS Topology).

   Export to KML (Google Earth)
       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 ...

REFERENCES

           ·   OGR vector library

           ·   OGR vector library C API documentation

SEE ALSO

        v.out.postgis, db.out.ogr, v.external, v.external.out, v.in.ogr, v.pack

AUTHORS

       Radim Blazek, ITC-Irst, Trento, Italy
       Some contributions: Markus Neteler
       Multi-feature support by Martin Landa, Czech Technical University in Prague, 2013

       Last changed: $Date: 2017-10-25 23:32:54 +0200 (Wed, 25 Oct 2017) $

SOURCE CODE

       Available at: v.out.ogr source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.1 Reference Manual