NAME

KEYWORDS

SYNOPSIS

Flags:

-l

List available layers in data source and exit

-f

List available formats and exit

-c

Do not clean polygons (not recommended)

-z

Create 3D output

-t

Do not create attribute table

-o

Override projection (use location's projection)

-e

Extend location extents based on new dataset

--overwrite

Force overwrite of output files

Parameters:

dsn=string

OGR datasource name. Examples:
ESRI Shapefile: directory containing shapefiles
MapInfo File: directory containing mapinfo files

output=name

Name for output vector map

layer=string[,string,...]

OGR layer name. If not given, all available layers are imported. Examples:
ESRI Shapefile: shapefile name
MapInfo File: mapinfo file name

spatial=float[,float,...]

Import subregion only (xmin,ymin,xmax,ymax - usually W,S,E,N)

where=sql_query

WHERE conditions of SQL statement without 'where' keyword. (example: income < 1000 and inhab >= 10000)

min_area=float

Minimum size of area to be imported (square units). Smaller areas and islands are ignored. Should be greater than snap^2

Default: 0.0001

type=string[,string,...]

Optionaly change default input type:
point -> import area centroids as points
line -> import area boundaries as centroids
boundary -> import lines as area boundaries
centroid -> import points as centroids

Options: point,line,boundary,centroid

Default:

snap=float

Snapping threshold for boundaries. -1 for no snap

Default: -1

location=string

Name for new location to create

cnames=string[,string,...]

List of column names to be used instead of original names, first is used for category column

DESCRIPTION

If the layer parameter is not given, all available layers are imported.

The optional spatial parameter defines spatial query extents. This parameter allows to restrict the region to a spatial subset while importing the data. All vector completely or partially falling into this rectangle subregion are imported.

Topology cleaning on areas is automatically performed, but may fail in special cases (then use v.clean).

Supported OGR Vector Formats

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.

Location Creation

If the user wishes to ignore the difference between the apparent coordinate system of the source data and the current location, they may pass the -o flag to override the projection check.

If the user wishes to import the data with the full projection definition, it is possible to have v.in.ogr automatically create a new location based on the projection and extents of the file being read. This is accomplished by passing the name to be used for the new location via the location parameter. Upon completion of the command, a new location will have been created (with only a PERMANENT mapset), and the vector map will have been imported with the indicated output name into the PERMANENT mapset.

EXAMPLES

• SHAPE files

  v.in.ogr dsn=/home/user/shape_data layer=test_shape output=grass_map 
  

  
  
• MapInfo files

  v.in.ogr dsn=./ layer=mapinfo_test output=grass_map
  

  
  
• Arc Coverage
  We import the Arcs and Label points, the module takes care to build areas:
  

  v.in.ogr dsn=gemeinden layer=LAB,ARC type=centroid,boundary output=mymap
  

  
  
• E00 file (see also v.in.e00)
  First we have to convert the E00 file to an Arc Coverage with 'avcimport' (AVCE00 tools, use e00conv first in case that avcimport fails):
  

  avcimport e00file coverage
  v.in.ogr dsn=coverage layer=LAB,ARC type=centroid,boundary output=mymap
  

  
  
• SDTS files (you have to select the CATD file)
  

  v.in.ogr dsn=CITXCATD.DDF output=cities
  

  
  
• TIGER files
  

  v.in.ogr dsn=input/2000/56015/ layer=CompleteChain,PIP output=t56015_all \
  type=boundary,centroid snap=-1
  

  
  
• PostGIS maps (area example)
  

  v.in.ogr dsn="PG:host=localhost dbname=postgis user=postgres" layer=polymap \
  output=polygons type=boundary,centroid
  

  
  
• Oracle Spatial maps
  Note that you have to set the environment-variables ORACLE_BASE, ORACLE_SID, ORACLE_HOME and TNS_ADMIN accordingly.

  v.in.ogr dsn=OCI:username/password@database_instance output=grasslayer layer=roads_oci
  

Support of database schema:

For schema support, first set a default schema with db.connect. If schema support is used the schema name must be specified whenever a db.* module is called.

Example:

  db.connect driver=pg database=test schema=user1 group=group1
  db.login driver=pg database=test user=user1 password=pwd1
  v.in.ogr dsn=./ layer=river output=river     # -> table user1.river
  db.select table=user1.river
  

  db.connect driver=pg database=test
  db.login driver=pg database=test user=user1 password=pwd1
  v.in.ogr dsn=./ layer=river output=river     # -> table public.river
  db.select table=river
  

NOTES

[A-Za-z][A-Za-z0-9_]*

The DBF database specification limits column names to 10 characters. If the default DB is set to DBF and the input data contains longer column/field names, they will be truncated. If this results in multiple columns with the same name then v.in.ogr will produce an error. In this case you will either have to modify the input data or use v.in.ogr's cnames parameter to rename columns to something unique. (hint: copy & modify the list given with the error message). Alternatively, change the local DB with db.connect.

If a message like "WARNING: Area size 1.3e-06, area not imported." appears, the min_area may be adjusted to a smaller value so that all areas are imported. Otherwise tiny areas are filtered out during import (useful to polish digitization errors or non-topological data).

REFERENCES

SEE ALSO

AUTHOR

Last changed: $Date: 2007/07/09 15:01:10 $

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