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| (Není zobrazeno 77 mezilehlých verzí od stejného uživatele.) |
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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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| ;Feature table "urbanarea"
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| \d urbanarea
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| <pre>
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| Table "public.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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| wkb_geometry | geometry |
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| cat | integer |
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| objectid | integer |
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| ua | character varying |
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| name | character varying |
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| ua_type | character varying |
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| Indexes:
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| "urbanarea_pk" PRIMARY KEY, btree (ogc_fid)
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| "urbanarea_geom_idx" gist (wkb_geometry)
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| Check constraints:
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| "enforce_dims_wkb_geometry" CHECK (st_ndims(wkb_geometry) = 2)
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| "enforce_geotype_wkb_geometry" CHECK (geometrytype(wkb_geometry) = 'POLYGON'::text OR wkb_geometry IS NULL)
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| "enforce_srid_wkb_geometry" CHECK (st_srid(wkb_geometry) = 900914)
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| </pre>
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| <source lang=sql>
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| SELECT cat, ua, name, ST_GeometryType(wkb_geometry) 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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| <source lang=sql>
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| SELECT topology.createtopology('urbanarea');
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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
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| ----+-----------+------+-----------
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| 1 | urbanarea | -1 | 0
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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 |
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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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| Check constraints:
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| "enforce_dims_geom" CHECK (st_ndims(geom) = 2)
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| "enforce_geotype_geom" CHECK (geometrytype(geom) = 'POINT'::text OR geom IS NULL)
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| "enforce_srid_geom" CHECK (st_srid(geom) = (-1))
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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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| \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 |
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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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| Check constraints:
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| "enforce_dims_geom" CHECK (st_ndims(geom) = 2)
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| "enforce_geotype_geom" CHECK (geometrytype(geom) = 'LINESTRING'::text OR geom IS NULL)
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| "enforce_srid_geom" CHECK (st_srid(geom) = (-1))
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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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| \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 |
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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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| Check constraints:
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| "enforce_dims_mbr" CHECK (st_ndims(mbr) = 2)
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| "enforce_geotype_mbr" CHECK (geometrytype(mbr) = 'POLYGON'::text OR mbr IS NULL)
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| "enforce_srid_mbr" CHECK (st_srid(mbr) = (-1))
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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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| == 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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| {{Databáze}}
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| {{GIS}}
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| {{GFOSS}}
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