= PostGIS topological editing =

'''Goal''': Implement [http://www.postgis.org PostGIS] geometry editing functionality in GRASS GIS (wxGUI digitizer and {{{v.edit}}} module)

See also [wiki:Grass7/VectorLib/OGRInterface OGR Interface] and [wiki:wxGUIDevelopment#Vectordigitizer wxGUI vector digitizer] roadmap.

== Tasks ==

 1. ~~Attribute table (write) access for OGR-linked vectors (direct or linked by {{{v.external}}})~~ (implemented in r47225)
 1. Improve OGR interface write access (in progress) - see [wiki:Grass7/VectorLib/OGRInterface OGR Interface]
 1. Implement PostgreSQL driver to read PostGIS geometry directly (not using OGR library)
 1. Extend PostgreSQL driver to write PostGIS geometry directly (not using OGR library)
 1. Implement GRASS-based topology management in PostgreSQL driver 
 1. Implement PostGIS-based topology management in PostgreSQL driver 
 1. Add more...

== Topology comparison ==

Topological elements in GRASS (see [http://grass.osgeo.org/programming7/vectorlib.html#vlibTopoManagement API manual]):

 * Nodes
 * Lines 
 * Areas
 * Isles

Topological elements in PostGIS (see [http://trac.osgeo.org/postgis/wiki/UsersWikiTopologicalPrimitives PostGIS's wiki]):

 * Nodes
 * Edges
 * Faces

== Roadmap ==

 1. Read access (geometry)
 1. Write access (geometry)

== References ==

 * http://trac.osgeo.org/grass/wiki/Grass7/VectorLib/PostGISEditing

== Pool ==
 
 * [source:sandbox/martinl/v.topo.pg.out v.topo.pg.out] - converts GRASS topology to PostGIS