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| {{Upravit}} | | {{freegiswiki|PostGIS Topology}} |
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| [http://trac.osgeo.org/postgis/wiki/UsersWikiPostgisTopology PostGIS Topology] je rozšíření pro [[PostGIS]] umožňující ''topologickou'' správu vektorových dat v prostředí PostGIS/[[PostgreSQL]].
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| Více přednášky [[153UZPD#Přednášky|Úvod do zpracování prostorových dat]].
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| == Příklad ==
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| <source lang=sql>
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| CREATE SCHEMA my_schema;
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| SET search_path TO my_schema,public;
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| CREATE TABLE kraje AS SELECT nuts3, st_multi(st_union(geom)) as geom FROM gis1.obce GROUP BY nuts3;
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| </source>
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| === Feature table 'urbanarea' ===
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| \d urbanarea
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| <pre>
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| Table "nc.urbanarea"
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| Column | Type | Modifiers
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| ----------+------------------------+-------------------------------------------------------------
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| ogc_fid | integer | not null default nextval('urbanarea_ogc_fid_seq'::regclass)
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| geom | geometry(Polygon,3358) |
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| cat | integer |
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| objectid | integer |
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| ua | character varying(5) |
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| name | character varying(90) |
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| ua_type | character varying(2) |
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| Indexes:
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| "urbanarea_pk" PRIMARY KEY, btree (ogc_fid)
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| "urbanarea_geom_idx" gist (geom)
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| </pre>
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| <source lang=sql>
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| SELECT cat, ua, name, ST_GeometryType(geom) from urbanarea limit 5;
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| </source>
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| <pre>
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| cat | ua | name | st_geometrytype
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| -----+-------+------------+-----------------
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| 1 | 29305 | Farmville | ST_Polygon
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| 2 | 92404 | Washington | ST_Polygon
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| 3 | 35380 | Greenville | ST_Polygon
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| 4 | 46315 | La Grange | ST_Polygon
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| 5 | 45397 | Kinston | ST_Polygon
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| </pre>
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| === Vytvoření topologického schématu 'urbanarea' ===
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| * [http://postgis.org/documentation/manual-svn/CreateTopology.html CreateTopology()]
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| <source lang=sql>
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| SELECT topology.createtopology('urbanarea', 3358);
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| </source>
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| <source lang=sql>
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| SELECT * from topology.topology;
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| </source>
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| <pre>
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| id | name | srid | precision | hasz
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| ----+-----------+------+-----------+------
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| 1 | urbanarea | 3358 | 0 | f
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| </pre>
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| \dt urbanarea.
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| <pre>
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| List of relations
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| Schema | Name | Type | Owner
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| -----------+-----------+-------+--------
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| urbanarea | edge_data | table | martin
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| urbanarea | face | table | martin
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| urbanarea | node | table | martin
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| urbanarea | relation | table | martin
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| </pre>
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| <pre>
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| \d urbanarea.node
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| Table "urbanarea.node"
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| Column | Type | Modifiers
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| -----------------+----------------------+------------------------------------------------------------------
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| node_id | integer | not null default nextval('urbanarea.node_node_id_seq'::regclass)
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| containing_face | integer |
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| geom | geometry(Point,3358) |
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| Indexes:
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| "node_primary_key" PRIMARY KEY, btree (node_id)
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| "node_gist" gist (geom)
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| Foreign-key constraints:
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| "face_exists" FOREIGN KEY (containing_face) REFERENCES urbanarea.face(face_id)
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| Referenced by:
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| TABLE "urbanarea.edge_data" CONSTRAINT "end_node_exists" FOREIGN KEY (end_node) REFERENCES urbanarea.node(node_id)
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| TABLE "urbanarea.edge_data" CONSTRAINT "start_node_exists" FOREIGN KEY (start_node) REFERENCES urbanarea.node(node_id)
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| </pre>
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| <pre>
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| \d urbanarea.edge_data
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| Table "urbanarea.edge_data"
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| Column | Type | Modifiers
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| ---------------------+---------------------------+-----------------------------------------------------------------------
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| edge_id | integer | not null default nextval('urbanarea.edge_data_edge_id_seq'::regclass)
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| start_node | integer | not null
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| end_node | integer | not null
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| next_left_edge | integer | not null
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| abs_next_left_edge | integer | not null
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| next_right_edge | integer | not null
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| abs_next_right_edge | integer | not null
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| left_face | integer | not null
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| right_face | integer | not null
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| geom | geometry(LineString,3358) |
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| Indexes:
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| "edge_data_pkey" PRIMARY KEY, btree (edge_id)
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| "edge_gist" gist (geom)
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| "edge_left_face_idx" btree (left_face)
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| "edge_right_face_idx" btree (right_face)
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| Foreign-key constraints:
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| "end_node_exists" FOREIGN KEY (end_node) REFERENCES urbanarea.node(node_id)
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| "left_face_exists" FOREIGN KEY (left_face) REFERENCES urbanarea.face(face_id)
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| "next_left_edge_exists" FOREIGN KEY (abs_next_left_edge) REFERENCES urbanarea.edge_data(edge_id) DEFERRABLE INITIALLY DEFERRED
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| "next_right_edge_exists" FOREIGN KEY (abs_next_right_edge) REFERENCES urbanarea.edge_data(edge_id) DEFERRABLE INITIALLY DEFERRED
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| "right_face_exists" FOREIGN KEY (right_face) REFERENCES urbanarea.face(face_id)
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| "start_node_exists" FOREIGN KEY (start_node) REFERENCES urbanarea.node(node_id)
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| Referenced by:
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| TABLE "urbanarea.edge_data" CONSTRAINT "next_left_edge_exists" FOREIGN KEY (abs_next_left_edge) REFERENCES urbanarea.edge_data(edge_id) DEFERRABLE INITIALLY DEFERRED
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| TABLE "urbanarea.edge_data" CONSTRAINT "next_right_edge_exists" FOREIGN KEY (abs_next_right_edge) REFERENCES urbanarea.edge_data(edge_id) DEFERRABLE INITIALLY DEFERRED
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| </pre>
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| <pre>
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| \d urbanarea.face
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| Table "urbanarea.face"
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| Column | Type | Modifiers
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| ---------+------------------------+------------------------------------------------------------------
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| face_id | integer | not null default nextval('urbanarea.face_face_id_seq'::regclass)
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| mbr | geometry(Polygon,3358) |
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| Indexes:
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| "face_primary_key" PRIMARY KEY, btree (face_id)
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| "face_gist" gist (mbr)
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| Referenced by:
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| TABLE "urbanarea.node" CONSTRAINT "face_exists" FOREIGN KEY (containing_face) REFERENCES urbanarea.face(face_id)
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| TABLE "urbanarea.edge_data" CONSTRAINT "left_face_exists" FOREIGN KEY (left_face) REFERENCES urbanarea.face(face_id)
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| TABLE "urbanarea.edge_data" CONSTRAINT "right_face_exists" FOREIGN KEY (right_face) REFERENCES urbanarea.face(face_id)
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| </pre>
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| <pre>
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| \d urbanarea.relation
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| Table "urbanarea.relation"
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| Column | Type | Modifiers
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| --------------+---------+-----------
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| topogeo_id | integer | not null
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| layer_id | integer | not null
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| element_id | integer | not null
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| element_type | integer | not null
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| Indexes:
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| "relation_layer_id_key" UNIQUE, btree (layer_id, topogeo_id, element_id, element_type)
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| Triggers:
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| relation_integrity_checks BEFORE INSERT OR UPDATE ON urbanarea.relation FOR EACH ROW EXECUTE PROCEDURE relationtrigger('2', 'urbanarea')
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| </pre>
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| === Přidání atributu topologie do feature table ===
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| * [http://postgis.org/documentation/manual-svn/AddTopoGeometryColumn.html AddTopoGeometryColumn()]
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| <source lang=sql>
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| select topology.AddTopoGeometryColumn('urbanarea', 'my_schema', 'urbanarea', 'topo', 'POLYGON');
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| </source>
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| <pre>
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| \d urbanarea
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| ...
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| topo | topology.topogeometry |
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| ...
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| </pre>
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| <source lang=sql>
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| SELECT * FROM topology.layer;
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| </source>
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| <pre>
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| topology_id | layer_id | schema_name | table_name | feature_column | feature_type | level | child_id
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| -------------+----------+-------------+------------+----------------+--------------+-------+----------
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| 1 | 1 | my_schema | urbanarea | topo | 3 | 0 |
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| </pre>
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| ''Poznámka:'' <tt>feature_type</tt> '3' odpovídá 'face' (1 - node, 2 - edge).
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| === Sestavení topologie (Geometry → TopoGeometry) ===
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| * [http://postgis.org/documentation/manual-svn/toTopoGeom.html toTopoGeom()]
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| == Externí odkazy ==
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| * [http://2010.foss4g.org/presentations/3555.pdf State of the art of FOSS4G for topology and network analysis]
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| * [http://www.postgis.org/documentation/manual-svn/Topology.html PostGIS 2.0 Topology section of manual]
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| * [http://cs.wikipedia.org/wiki/Topologie Topogie] {{bullet}} [http://cs.wikipedia.org/wiki/Sedm_most%C5%AF_m%C4%9Bsta_Kr%C3%A1lovce Sedm mostů města Královce] {{bullet}} [http://en.wikipedia.org/wiki/Geographic_information_system#Topological_modeling Topological modeling]
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| * [http://cs.wikipedia.org/wiki/Geografick%C3%BD_informa%C4%8Dn%C3%AD_syst%C3%A9m#Vektorov.C3.A9_modely Vektorové modely]
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| * [http://strk.keybit.net/projects/postgis/ strk's page about PostGIS]
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| * [http://strk.keybit.net/blog/2011/10/14/postgis-topology-iso-sqlmm-complete/ PostGIS topology ISO SQL/MM complete]
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| {{Databáze}}
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| {{GIS}}
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| {{GFOSS}}
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