Topo Geometry

A TopoGeometry is a PostGIS type used to represent geometries defined by Topological elements (Face,Edge,Node,TopoGeometry).

Current code implements the TopoGeometry using a class defined under the topology schema (topology.TopoGeometry). This has the following fields:

• topology_id integer
• layer_id integer
• id integer
• type integer

The actual _definition_ of each TopoGeometry is contained in the relation table of the topology identified by "topology_id". The "relation" table contains a record for each component of each TopoGeometry. Interpretation of the component also requires looking at the topology.layer table, which tells if element_type refers to primitive type (node, edge, face) or another layer (in case of hierarchical TopoGeometry).

See CreatingTopoGeometryObjects for information on how to create a TopoGeometry.

See PostgisTopology.