# Vector topology

From GRASS-Wiki

**Q:** What is the difference between pseudo-topology and real topology?

**A:** The differences are listed in the table below.

Basically a full topological format knows what 'network' is so that every node is directly related with his degree of connection. Boundary lines dividing areas are simply arcs connected together, there is no need to duplicate any basic geometric feature (vertex or arc), even if it belongs to more than one geometric entity.

pseudo-topological * full-topological -----------------------------------------*------------------------------------- * adjacent area boundaries are duplicated * a single boundary can share several * areas * *