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v.external.1grass
Langue: en
Version: 332668 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
Sommaire
NAME
v.external - Creates a new vector as a read-only link to OGR layer.Available drivers: ESRI Shapefile,MapInfo File,UK .NTF,SDTS,TIGER,S57,DGN,VRT,REC,Memory,BNA,CSV,GML,GPX,KML,GeoJSON,Interlis 1,Interlis 2,GMT,SQLite,ODBC,PGeo,OGDI,PostgreSQL,MySQL,XPlane,AVCBin,AVCE00,Geoconcept
KEYWORDS
vectorSYNOPSIS
v.externalv.external help
v.external dsn=string [output=name] [layer=string] [--overwrite] [--verbose] [--quiet]
Flags:
- --overwrite
Allow output files to overwrite existing files- --verbose
Verbose module output- --quiet
Quiet module output
Parameters:
- dsn=string
OGR datasource name. Examples:
ESRI Shapefile: directory containing shapefiles MapInfo File: directory containing mapinfo files- output=name
Output vector. If not given, available layers are printed only.- layer=string
OGR layer name. If not given, available layers are printed only. Examples:
ESRI Shapefile: shapefile name MapInfo File: mapinfo file name
DESCRIPTION
v.external creates new vector as a link to external OGR layer (read only). OGR (Simple Features Library) is part of the GDAL library, so you need to install GDAL to use v.external and external OGR layers.Supported OGR Vector Formats
ESRI ShapefileMapinfo File
Further available drivers such as UK .NTF, SDTS, TIGER, IHO S-57 (ENC), DGN, GML, AVCBin, REC, Memory, OGDI, and PostgreSQL depend on the local installation (OGR library), for details see OGR web site.
EXAMPLES
SHAPE filesv.external dsn=/home/user/shape_data layer=test_shape output=grass_map
MapInfo files
v.external dsn=./ layer=mapinfo_test output=grass_map
SDTS files (you have to select the CATD file)
v.external dsn=CITXCATD.DDF output=cities
TIGER files
v.external dsn=input/2000/56015/ layer=CompleteChain,PIP output=t56015_all
PostGIS maps (area example)
v.external dsn="PG:host=localhost user=postgres dbname=postgis" layer=polymap \
output=polygons
NOTES
The simple feature data model used by OGR is very different from the topological format used by GRASS. Instead of true topology, so called 'pseudo topology' is created for data linked by v.external. User should learn the difference between those to formats, because some modules working correctly with GRASS native data, can produce wrong results with input layers created by v.external.See v.db.connect for an example of maintaining attributes in external DBMS in also writeable mode.
REFERENCES
OGR vector libraryOGR vector library C API documentation
SEE ALSO
v.clean, v.db.connect, v.in.db, v.in.ogr, v.out.ogrAUTHOR
Radim Blazek, ITC-Irst, Trento, ItalyLast changed: $Date: 2006-03-21 19:22:37 +0100 (mar, 21 mar 2006) $
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