Re: [postgis-users] topology : statue of topogeom composition?
On Thu, Nov 12, 2015 at 06:43:03PM +0100, Rémi Cura wrote: > First of all is it possible to have topogeometry composed of other > topogeometry, themselves composed of other geometry, and so one? Yes, when the TopoGeometry layer is a "hierarchical layer" (has a not null "child_layer" value in topology.layer) then the "type" field of its TopoElements references its child layer id and the "id" field references the identifier of a coposing TopoGeometry object. > Second, > if this is possible, are this kind of topogeometry properly maintained when > there is a change in the low level topology (splitting an edge for > instance). The upper levels are composed by the lower levels. The lowest levels (primitive layers) are properly maintained and thus the higher one are too. --strk; () Free GIS & Flash consultant/developer /\ http://strk.keybit.net/services.html ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/postgis-users
Re: [postgis-users] topology : statue of topogeom composition?
Thanks! Cheers, Rémi-C 2015-11-16 8:49 GMT+01:00 Sandro Santilli : > On Thu, Nov 12, 2015 at 06:43:03PM +0100, Rémi Cura wrote: > > > First of all is it possible to have topogeometry composed of other > > topogeometry, themselves composed of other geometry, and so one? > > Yes, when the TopoGeometry layer is a "hierarchical layer" > (has a not null "child_layer" value in topology.layer) then > the "type" field of its TopoElements references its child layer > id and the "id" field references the identifier of a coposing > TopoGeometry object. > > > Second, > > if this is possible, are this kind of topogeometry properly maintained > when > > there is a change in the low level topology (splitting an edge for > > instance). > > The upper levels are composed by the lower levels. > The lowest levels (primitive layers) are properly maintained > and thus the higher one are too. > > --strk; > > () Free GIS & Flash consultant/developer > /\ http://strk.keybit.net/services.html > ___ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/postgis-users
