PostGIS

See also working with external data in GRASS 7.

Help pages

• Database management in GRASS GIS help page
• SQL support in GRASS GIS help page

• PostgreSQL driver in GRASS help page
• grass-odbc help page

Link to external dataset

• v.external

Import into GRASS

1. v.in.ogr (import only geometry column from postgresql/postgis)
2. v.clean

There is a fundamental difference between the PostGIS format which is non-topological and the internal GRASS format which is topological and which, thus, does not really allow for overlapping polygons. You can digitize them, but they are not really useful...

You cannot directly process a PostGIS table in GRASS. GRASS has its own internal vector format.

You can link a GRASS layer to a PostgreSQL attribute table, though. v.db.connect

See also

• Tutorial by Micha Silver