[OSM-dev] Topologicial correctness in OSM

Nicola Ranaldo ranaldo at unina.it
Wed Jan 17 20:15:37 GMT 2007


On Wednesday 17 January 2007 19:33, Nick Black wrote:
[...]
> So * is the node, which in the OSM model, has Lat, Lon and ID.  ----
> and | are roads that intersect - they share the same node ID, which is
> how we maintain topological correctness.
>
> TAB files *must* store these relationships, or they would be totally
> useles.  I just need to figure out how they (or PG once they are
> inported into it) deals with topology...

It seems as not all models store topological informations, for example check 
http://en.wikipedia.org/wiki/Shapefile#Topology_and_shapefiles .
So it may be that during conversion between different formats they are losed.

	Niko




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