ÐÐÐСÐÐÐÐ

   v.external creates new vector as a link to external [1]OGR layer (read
   only). OGR (Simple Features Library) is part of the [2]GDAL library, so
   you need to install GDAL to use v.external and external OGR layers.

  Supported OGR Vector Formats

   [3]ESRI Shapefile
   [4]Mapinfo 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 [5]OGR web site.

ÐÐ ÐÐÐРЫ

   SHAPE files

v.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

ÐÐ ÐÐÐЧÐÐÐЯ

   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 [6]v.db.connect for an example of maintaining attributes in
   external DBMS in also writeable mode.

ССЫÐÐÐ

   [7]OGR vector library
   [8]OGR vector library C API documentation

СÐ. ТÐÐÐÐ

   [9]v.clean, [10]v.db.connect, [11]v.in.db, [12]v.in.ogr, [13]v.out.ogr

ÐÐТÐÐ

   Radim Blazek, ITC-Irst, Trento, Italy

   Last changed: $Date: 2006-03-21 12:22:37 -0600 (ÐÑ, 21 Ð¼Ð°Ñ 2006) $

ÐвÑÐ¾Ñ Ð¿ÐµÑевода

References

   1. http://www.gdal.org/ogr/
   2. http://www.gdal.org/
   3. http://www.gdal.org/ogr/drv_shapefile.html
   4. http://www.gdal.org/ogr/drv_mitab.html
   5. http://www.gdal.org/ogr/ogr_formats.html
   6. file://localhost/root/tmp/2/fin/v.db.connect.html
   7. http://www.gdal.org/ogr/
   8. http://www.gdal.org/ogr/ogr__api_8h.html
   9. file://localhost/root/tmp/2/fin/v.clean.html
  10. file://localhost/root/tmp/2/fin/v.db.connect.html
  11. file://localhost/root/tmp/2/fin/v.in.db.html
  12. file://localhost/root/tmp/2/fin/v.in.ogr.html
  13. file://localhost/root/tmp/2/fin/v.out.ogr.html