PostGIS topological editing

Goal: Implement ​PostGIS geometry editing functionality in GRASS GIS (wxGUI digitizer and v.edit module)

See also OGR Interface and wxGUI vector digitizer roadmap.

Tasks

1. Attribute table (write) access for OGR-linked vectors (direct or linked by v.external) (implemented in r47225)
2. Improve OGR interface write access (in progress) - see OGR Interface
3. Implement PostgreSQL driver to read PostGIS geometry directly (not using OGR library)
4. Extend PostgreSQL driver to write PostGIS geometry directly (not using OGR library)
5. Implement GRASS-based topology management in PostgreSQL driver
6. Implement PostGIS-based topology management in PostgreSQL driver
7. Add more...

Topology models in GRASS and PostGIS

Topological elements in GRASS (see ​API manual):

• Nodes
• Lines
• Areas
• Isles

Topological elements in PostGIS (see ​PostGIS's wiki):

• Nodes
• Edges
• Faces

Roadmap

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

References

• ​http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete

Pool

• v.topo.pg.out​ - converts GRASS topology to PostGIS