[postgis-users] Extract nodes in a Polygon Mosaic (Topology)

Andreas Neumann a.neumann at carto.net
Tue Oct 16 04:32:18 PDT 2007


Hello all,

I have a polygon mosaic (lets say administrative units, municipalities)
and would like to get a list of nodes where 3 or more polygons meet or 2
polygons depart at the edge of the mosaic. Is there any straight forward
way to extract these nodes?

I have read about topology support in Postgis and found this:
http://postgis.refractions.net/support/wiki/index.php?PostgisTopology -
whats the state of this project?

Thanks for any hints on my two questions.

Andreas


-- 
Andreas Neumann
Böschacherstrasse 6, CH-8624 Grüt/Gossau, Switzerland
Email: a.neumann at carto.net, Web:
* http://www.carto.net/ (Carto and SVG resources)
* http://www.carto.net/neumann/ (personal page)
* http://www.svgopen.org/ (SVG Open Conference)
* http://www.geofoto.ch/ (Georeferenced Photos of Switzerland)




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