PostGIS Topology
PostGIS Topology je rozšíření pro PostGIS umožňující topologickou správu vektorových dat v prostředí PostGIS/PostgreSQL.
Více přednášky Úvod do zpracování prostorových dat.
\d urbanarea Table "public.urbanarea" Column | Type | Modifiers --------------+-------------------+------------------------------------------------------------- ogc_fid | integer | not null default nextval('urbanarea_ogc_fid_seq'::regclass) wkb_geometry | geometry | cat | integer | objectid | integer | ua | character varying | name | character varying | ua_type | character varying | Indexes: "urbanarea_pk" PRIMARY KEY, btree (ogc_fid) "urbanarea_geom_idx" gist (wkb_geometry) Check constraints: "enforce_dims_wkb_geometry" CHECK (st_ndims(wkb_geometry) = 2) "enforce_geotype_wkb_geometry" CHECK (geometrytype(wkb_geometry) = 'POLYGON'::text OR wkb_geometry IS NULL) "enforce_srid_wkb_geometry" CHECK (st_srid(wkb_geometry) = 900914)