Yep, I have TopoGeometry fields. -- counties "Topology topo_kraje (12), SRID 4326, precision 0 36 nodes, 48 edges, 14 faces, 14 topogeoms in 1 layers Layer 1, type Polygonal (3), 14 topogeoms Deploy: edpp.kraje.topo " -- districts "Topology topo_orp (13), SRID 4326, precision 0 962 nodes, 1611 edges, 651 faces, 206 topogeoms in 1 layers Layer 1, type Polygonal (3), 206 topogeoms Deploy: edpp.orp.topo "
On 10/11/12, Sandro Santilli <s...@keybit.net> wrote: > On Thu, Oct 11, 2012 at 12:10:34PM +0200, Michal Zimmermann wrote: >> Sandro, >> earlier you said >> >One benefit is making the spatial relationships explicit, so that >> > you could encode your counties as being composed by the districts, >> > and the districts would be composed by faces, which would be defined >> > by (shared) edges. >> > At that point querying for "all districts in a county" would just be >> > a matter of listing the components of a "county" TopoGeometry. >> >> Does this mean it is better approach to have only one topology enabled >> layer (in my case districts) with features having some id of which >> county they belong to? In the end, I need to have county > districts > >> cadastral areas chain (all of them being represented as polygons). >> Right now I have both counties and districts layer with topology, but >> I can't see a way to join them (e. g. to "select all districts from >> counties where county.id = 1"). > > You mean you have TopoGeometry fields ? > Show the output of TopologySummary(<your_topology_name>) > > --strk; > > http://www.cartodb.com - Map, analyze and build applications with your > data > > ~~ http://strk.keybit.net > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- Michal Zimmermann (zimmi) WWW: http://www.zimmi.cz _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
