NAME¶
v.out.ogr - Converts GRASS vector map to one of the supported OGR
vector formats.
KEYWORDS¶
vector, export
SYNOPSIS¶
v.out.ogr
v.out.ogr help
v.out.ogr [-
uscezp]
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)
- -z
-
Create 3D output if input is 3D (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(s). Combinations not supported by all output formats. Default:
first type found in input.
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,LIBKML,KML,GeoJSON,Interlis_1,Interlis_2,GMT,SQLite,ODBC,MSSQLSpatial,PostgreSQL,MySQL,PCIDSK,DXF,Geoconcept,GeoRSS,GPSTrackMaker,PGDump,GPSBabel,GFT,CouchDB,ODS,XLSX,ElasticSearch,PDF
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:
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.
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: 2014-01-02 22:54:21 +0100 (Thu, 02 Jan 2014) $
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