[http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete/]
PostGIS implementation of the ISO SQL/MM Topology-Geometry model is finally complete [1]. The SQL/MM model [2] is just a portion of the whole topology support [3], but an important one, including schema definition and functions to create and populate the schema with primitive components (nodes, edges, faces). In addition to the base model, PostGIS adds a TopoGeometry [4] data type for use wherever you would normally use a Geometry type, except the former will be defined by references to primitive, shared, topological components. The work on SQL/MM topology for PostGIS 2.0 was mainly funded by the Land Management department of the Tuscany Region as part of a larger project aimed at enhancing effectiveness of free software tools already in use within the institution for the management of the topographic database. But more work is needed to make it easier to convert your layers to topological layers, your Geometries to TopoGeometries [5]. Because I know you want to generalize your vectors in a topologically consistent way, don’t you ? And you want to edit the boundaries just once. And do you want to waste all that space for your triangles ? Feature freeze for 2.0 will be at the end of November. Please drop a note if you’d like to help with getting the enhanced TopoGeometry constructor [5] shipped with it ! [1] http://trac.osgeo.org/postgis/changeset/7886 [2] http://pdfqueen.com/h2-topo-geo [3] http://postgis.refractions.net/documentation/manual-svn/Topology.html [4] http://trac.osgeo.org/postgis/wiki/UsersWikiTopoGeometry [5] http://trac.osgeo.org/postgis/ticket/1017 --strk; () Free GIS & Flash consultant/developer /\ http://strk.keybit.net/services.html _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
