[postgis-users] Topological editing with OpenLayers

[Jan Hartmann]

Hi all,

I have written a simple OpenLayers-application to edit a PostGIS polygon 
layer: read one polygon from the server as GeoJSON, adapt it 
interactively, and write it back again via GeoJSON. Points are only 
moved, not created or deleted.

The polygon layer is topologically correct: all adjoining polygons share 
the same points. With QGIS I can choose "topological editing", to 
automatically move corresponding points from adjoining polygons. With 
the GeoJSON application that is not possible: whenever I move a boundary 
point of one polygon, the corresponding points on adjoining polygons 
remain where they are.

Is it possible with the new topology methods in PostGIS to write the 
following update procedure: whenever a changed polygon is written back 
into the database, all corresponding points on neighbouring polygons 
will be looked up and changed as well? I guess I would need some sort of 
pointer for all boundary points to all other boundary points that share 
the same location.

Jan
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