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v.external.out(1)	    GRASS GIS User's Manual	     v.external.out(1)

NAME
       v.external.out  - Defines vector	output format.

KEYWORDS
       vector, export, output, external, OGR, PostGIS

SYNOPSIS
       v.external.out
       v.external.out --help
       v.external.out	[-frpg]	   [output=string]     [format=string]	  [op-
       tions=string[,string,...]]   [loadsettings=name]	   [savesettings=name]
       [--overwrite]  [--help]	[--verbose]  [--quiet]	[--ui]

   Flags:
       -f
	   List	supported formats and exit

       -r
	   Cease using OGR/PostGIS, revert to native output and	exit

       -p
	   Print current status

       -g
	   Print current status	in shell script	style

       --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:
       output=string
	   Name	of output directory or OGR or PostGIS data source
	   Examples:
	   A A A A A A A A ESRI	Shapefile: directory containing	a shapefile
	   A A A A A A A A MapInfo File: directory containing a	mapinfo	file
	   A A A A A A A A PostGIS  database:  connection  string, eg. 'PG:db-
	   name=db user=grass'

       format=string
	   Format for output vector data
	   Options: BNA, CSV, DGN, DXF,	ESRI_Shapefile,	FlatGeobuf, GML,  GPS-
	   Babel, GPSTrackMaker, GPX, GeoJSON, GeoJSONSeq, GeoRSS, Geoconcept,
	   JML,	KML, MapInfo_File, MapML, Memory, OGR_GMT, PCIDSK, PDF,	 PDS4,
	   PGDUMP, S57,	Selafin, TIGER,	VDV, VICAR, WAsP
	   Default: ESRI_Shapefile

       options=string[,string,...]
	   Creation options
	   Examples:
	   A A A A A A A A 'SHPT=POINTZ': create 3D point Shapefile data
	   A A A A A A A A 'GEOM_TYPE=geography': use geography	PostGIS	data
	   A A A A A A A A 'SCHEMA=grass':   create   new  PostGIS  tables  in
	   'grass' schema

       loadsettings=name
	   Name	of input file to read settings from

       savesettings=name
	   Name	for output file	where to save current settings

DESCRIPTION
       v.external.out instructs	GRASS to write vector maps  in	external  data
       format  (e.g.  ESRI  Shapefile, Mapinfo,	and others) using OGR library.
       PostGIS data  can  be  also  written  by	 built-in  GRASS-PostGIS  data
       provider.

NOTES
       Number  of  available output formats (v.external.out -f)	depends	on OGR
       installation. 'PostgreSQL' format is presented also  when  GRASS	 comes
       with  PostgreSQL	 support  (check for '--with-postgres' in g.version -b
       output).

       To store	geometry and attribute data in PostGIS database	 ('PostgreSQL'
       format)	GRASS  uses built-in GRASS-PostGIS data	provider. PostGIS data
       can be written also by OGR library when GRASS_VECTOR_OGR	 environmental
       variable	is defined or GRASS is not compiled with PostgreSQL support.

       Creation	options	refer to the output format specified by	format option.
       See the list of valid creation options  at  OGR	formats	 specification
       page,  example for ESRI Shapefile or PostgreSQL/PostGIS format (section
       "Layer  Creation	  Options").   Options	 are   comma-separated	 pairs
       (key=value),    the    options	 are	case-insensitive,    eg.   op-
       tions="SCHEMA=myschema,FID=cat".

   PostgreSQL/PostGIS Creation Options
       Note that built-in GRASS-PostGIS	data provider (format=PostgreSQL) sup-
       ports  different	creation options compared to PostgreSQL/PostGIS	driver
       from OGR	library:

	   o   SCHEMA=<name> - name of schema where to create feature  tables.
	       If schema doesn't exists, it's automatically created when writ-
	       ing PostGIS data.

	   o   FID=<column> - name of column which will	be used	as primary key
	       (feature	id), default: fid

	   o   GEOMETRY_NAME=<column>  name  of	 column	which will be used for
	       storing geometry	data in	feature	table, default:	geom

	   o   SPATIAL_INDEX=YES|NO - enable/disable spatial index on geometry
	       column, default:	YES

	   o   PRIMARY_KEY=YES|NO  - enable/disable primary key	on FID column,
	       default:	YES

	   o   SRID=<value> - spatial reference	identifier, default:  not  de-
	       fined

	   o   TOPOLOGY=YES|NO	-  enable/disable native PostGIS topology, de-
	       fault: NO
       Options relevant	only to	topological output (TOPOLOGY=YES):

	   o   TOPOSCHEMA_NAME=<schema name> - name of PostGIS Topology	schema
	       (relevant only for TOPOLOGY=YES), default: topo_<input>

	   o   TOPOGEOM_NAME=<column>  - name of column	which will be used for
	       storing topogeometry data in feature table, default: topo

	   o   TOPO_TOLERANCE=<value> -	tolerance for PostGIS Topology schema,
	       see CreateTopology function for defails,	default: 0

	   o   TOPO_GEO_ONLY=YES|NO  -	store  in PostGIS Topology schema only
	       data relevant to	Topo-Geo data model, default: NO

	   o   SIMPLE_FEATURE=YES|NO - build simple features geometry in GEOM-
	       ETRY_NAME column	from topogeometry data,	default: NO
       Note that topological output requires PostGIS version 2 or later.

EXAMPLES
   ESRI	Shapefile
       v.external.out  can  be	used along with	v.external to process external
       geodata in GRASS	while writing out the results  directly	 eg.  in  ESRI
       Shapefile format:
       # register Shapefile in GRASS mapset:
       v.external input=/path/to/shapefiles layer=cities
       # define	output directory for GRASS calculation results:
       v.external.out output=$HOME/gisoutput
       # do something (here: spatial query), write output directly as Shapefile
       v.select	ainput=cities atype=point binput=forests btype=area operator=within output=fcities
       Current settings	can be printed using -p	or -g flag.
       v.external.out -p
       output: /path/to/home/gisoutput
       format: ESRI Shapefile

   PostGIS (simple features)
       PostGIS data can	be accessed directly using GRASS-PostGIS data provider
       (GRASS must be compiled with PostgreSQL support).
       # register PostGIS table	in GRASS mapset:
       v.external output=PG:dbname=gisdb layer=cities
       # define	output PostGIS database	for GRASS calculation results stored as	simple features:
       v.external.out output=PG:dbname=gisdb format=PostgreSQL
       # do some processing...
       Note: If	the environment	variable GRASS_VECTOR_OGR is defined, or GRASS
       is  compiled  without PostgreSQL	support	then GRASS will	use PostgreSQL
       driver from OGR library for reading and writing PostGIS data.

   PostGIS Topology
       # define	output PostGIS database	for GRASS calculation results stored as	topological elements:
       v.external.out output=PG:dbname=gisdb format=PostgreSQL options=topology=YES
       # do some processing...
       Note:  PostGIS  topological  access  is	supported  only	 in   built-in
       GRASS-PostGIS data provider.

   GRASS native	format
       To restore original settings, ie. use the GRASS native format, type:
       v.external.out -r

   Restore settings
       Current settings	can be stored to file by specifying output option.
       # define	output PostGIS database	for GRASS calculation with
       # results stored	as topological elements:
       v.external.out output=PG:dbname=gisdb format=PostgreSQL \
	 options=topology=YES savesettings=gisdb_topo.txt
       # ... and do some processing in PostGIS Topology
       Back to native format:
       v.external.out -r
       # do some processing in native format
       Restore	previous  settings  from  "gisdb_topo.txt"  file by specifying
       loadsettings option.
       v.external.out loadsettings=gisdb_topo.txt
       # ... and do some processing in PostGIS Topology

REFERENCES
	   o   GRASS-OGR data provider

	   o   OGR vector library C API	documentation

	   o   GRASS-PostGIS data provider

	   o   libpq - C Library

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

       See also	GRASS user wiki	page for more examples.

AUTHOR
       Martin Landa, Czech Technical University	in Prague, Czech Republic (de-
       velopment  supported  by	 Fondazione  Edmund Mach and Comune di Trento,
       Italy)

SOURCE CODE
       Available at: v.external.out source code	(history)

       Main index | Vector index | Topics index	| Keywords index  |  Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.4 Reference	Manual

GRASS 7.8.4						     v.external.out(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLES | REFERENCES | SEE ALSO | AUTHOR | SOURCE CODE

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