Dear Stephen, Sandro, Thanks again for the pointers. I have looked through a few links, and in particular the presentation from October 2011 (FOSS2011). The page 10 summarizes exactly what I am looking for, and so does the conceptual model on p17 (http://strk.keybit.net/projects/postgis/Paris2011_TopologyWithPostGIS_2_0. pdf). But I need a clarification - two questions: - is the hierarchicalTopoGeom somehow explicitly created, or is it just a part of topoGeom internal implementation? Can I profit of this hierarhcial topological concept directly? - If I build a TopoGEom, and run ST_SimplifyPReserveTopology on it, will the nodes be respected and the topology preserved in the output (the result should be a topogeom...)?
I think that the best way for this hierarchical scenarios is to start from the finest geographies and aggregate upwards on the generalised ones. I will have to somehow control for the intermediate nodes that are not valid for higher order geometries (joins of suburbs on the state boundary, etcŠ), but that I could solve somehow. Thanks, Martin -- Martin Tomko, PhD. Senior Project Manager, Information Infrastructure Design, AURIN Level 5, Architecture Building University of Melbourne VIC 3010 AUSTRALIA T: +61 3 9035 3298 E: tom...@unimelb.edu.au <mailto:tom...@unimelb.edu.au> W: www.aurin.org.au <www.aurin.org.au> W: http://www.tomko.org On 14/03/12 6:00 AM, "postgis-users-requ...@postgis.refractions.net" <postgis-users-requ...@postgis.refractions.net> wrote: >Re: [postgis-users] Simplify a perfect (hierarchical) > partition of polygons (ST_SimplifyPreserveTopology and friends) _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
