Olivier Courtin - PostGIS from 1.4 to 2.0: what is really new?
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Olivier Courtin from Oslandia talks about the new features and functionalities coming to PostGIS 2.0 . The presentation is part of the Geomatics Open Guest Lectures series at TU Delft.
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Olivier Courtin - PostGIS from 1.4 to 2.0: what is really new?
- 1. PostGIS from 1.4 to 2.0: what's (really) news ? Olivier COURTIN, Oslandia
- 2. Oslandia Young French SME Open Source GIS company PostGIS Experts: Vincent Picavet and Olivier Courtin Mainly Focuses on: - Spatial Databases (PostGIS, SpatiaLite) - OGC, ISO, INSPIRE Standards and SDI architecture - Complex analysis: Routing, Network and Graphs Solutions Oslandia Ecosystem:
- 3. Oslandia skills cloud tags 3D GDAL GEOS GRASS GraphServer INSPIRE MapServer OGC PgRouting PostGIS PostgreSQL Spatialite TinyOWS TileCache PyWPS QGIS
- 4. PostGIS Key Points Spatial database plugin for PostgreSQL ● The Open Source spatial database reference, worldwide ● ● Initially conceived by Refractions Research (2001) ● Became an OsGeo project (2011) ● Currently under active development by a pool of companies ● ●
- 5. Spatial Database alternates (from real world) ● Oracle Spatial Most serious and widely used alternative, but not Open Source, and expensive. ● ● ● SpatiaLite Clever technical solution, mostly dedicaced for embedded or mobile apps. SQL Server 2008 Still quite recent solution, so not (yet) supported by alls/a lot of third part tools. ● ●
- 6. PostGIS : Commiters and Companies Keybit LisaSoft OpenGeo Oslandia CadCorp Paragon Corporation Refractions Research Sirius
- 7. PostGIS : Project Robustness Keybit LisaSoft OpenGeo Oslandia So even if a company behind PostGIS (or 2 or 3) have to stop or disappear: PostGIS will go on. CadCorp Paragon Corporation Refractions Research Sirius
- 8. Who use PostGIS ? ● Thousands of project worldwide use PostGIS. ● ● Few among them: ● ● ● ● ● ●
- 9. PostGIS Architecture GEOS GEOS PostGIS PostGIS Proj4 Plugin Proj4 Plugin PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeo Liblwgeo mm
- 10. PostGIS Architecture: PostgreSQL GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom The database engine SQL 92 (and 99) compliancy Robust, powerfull, extensible, fast and (quite) easy to administrate.
- 11. PostGIS Architecture: PostGIS GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom The PostGIS spatial extension, Provide spatial types and functions.
- 12. PostGIS Architecture: Liblwgeom GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom PostGIS sub library Handle most of the low level operations not directly tied to the database
- 13. PostGIS Architecture: GEOS GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom C++ Topology library Implement also some spatial algorithms (Douglas Peuker, Hausdorff distance...)
- 14. PostGIS Architecture: Proj4 GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom Projection Library Handle on the fly reprojection (ST_Transform)
- 15. PostGIS Architecture: LibXML2 GEOS GEOS PostGIS Plugin PostGIS Plugin Proj4 Proj4 PostgreSQL PostgreSQL LibXML2 LibXML2 Liblwgeom Liblwgeom XML parser library Used to parse XML geometry input (GML, KML)
- 16. Spatial database standards ISO TC 211 ISO 19125 2004 OGC OGC SFS 1.1 OGC SFS 1.2.0 SFS WG 1999 2006 ISO JTC1 ISO SQL/MM ISO SQL/MM ISO SQL/MM SC32 WG4 2003 2006 Draft 2009
- 17. PostGIS main past Milestones Support for spatial predicates with GEOS 0.8 2003 Lightweight geometry support (binary LWGEOM) 1.0 OGC Simple Feature for SQL (SFS) compliancy. 2005 Begin to reach ISO SQL/MM compliancy. 1.3 2006
- 18. Spatial database standards ISO TC 211 ISO 19125 2004 OGC OGC SFS 1.1 OGC SFS 1.2.0 SFS WG 1999 2006 ISO JTC1 ISO SQL/MM ISO SQL/MM ISO SQL/MM SC32 WG4 2003 2006 Draft 2009
- 19. PostGIS Latest Milestones PostGIS 1.4 PostGIS 1.5 PostGIS 2.0 July 2009 February 2010 ~ September 2011
- 20. 1.4: High Level Management Functions ST_Populate_Geometry_Columns() ST_UpdateGeometrySRID()
- 21. 1.4: Documentation Fully Rewritten
- 22. 1.4: ST_Union Performance Improve SELECT ST_Union(the_geom) from province; Version 1.3: 10865 ms Version 1.4: 2391 ms
- 23. 1.5: Distance Function Performance Clear performance improvement Distance results should be kept slightly the same New related functions: ST_ClosestPoint ST_DFullyWithin ...
- 24. 1.5: Import GML and KML Result: SRID=27582;POINT(600400 2428686)
- 25. 1.5: Geography GEOGRAPHY type (SRID 4326) Spatial index support About 20 Basics spatial functions supported (on Geocentric datas) Cast from/to GEOMETRY
- 26. What new features planned for 2.0 release ? Enhanced functions for cleaning data Topology support (ISO SQL-MM) Integration of PostGIS Raster Multidimensional Indexes 3D geometries primitives
- 27. 2.0: ST_MakeValid Invalid Geometries (OGC SFS) SELECT ST_CollectionExtract( ST_MakeValid(the_geom), 3 ) FROM spatial_table;
- 28. 2.0: Topology Aim is to add a true topological model (faces, nodes, edges) upon spaghettis geometries. Already described in ISO SQL/MM. For now PostGIS Topology functions mainly focus on: •Creation •Management •Accessor •GML output Common uses cases: •Networks and graphs •Choropleth •...
- 29. 2.0: Multidimensional Spatial Index GIN
- 30. 2.0: PostGIS Raster Project started by Pierre Racine in early 2008 Now (1.5) with additional PostGIS Raster we could use and manipulate RASTER data from PostGIS. PostGIS 2.0 will provide build in Raster support
- 31. 2.0: PostGIS Raster architecture GDAL is used to access to Raster data A tool to load raster into database: raster2pgsql.py Raster data could be stored either: – Inside database (as WKB) – Outside the database (as JPEG or GeoTIFF) Inside JPEG or Database GeoTIFF as WKB External Storage on Filesystem
- 32. 2.0: PostGIS Raster basic concepts • One table means one raster coverage (like a vector coverage) • One row means one tile or one raster object (like a vector coverage where one row means one geometry) • One new type: RASTER (like the PostGIS GEOMETRY type)
- 33. 2.0: PostGIS Raster SELECT A.rid, g.gid , ST_Intersects(A.rast, g.geom) As inter FROM a_rast AS A CROSS JOIN (VALUES (1, 'POINT(34.24, 57.85)'::geometry) , (2, 'LINESTRING(34.85 57.75,34.8 57.85)'::geometry) ) AS g(gid,geom) WHERE A.rid = 2 ;
- 34. PostGIS 2.0 Roadmap – Core development: July 2010 – July 2011 – Feature Freeze:~August 2011 – 2.0 release: ~ September 2011
- 35. Conclusions PostGIS is a mature and stable project Already became a true alternative to closed source spatial databases. Several news features are planned for PostGIS 2.0 PostGIS is currently 'only' limited by the funds it could gathered. University and research projects are truly welcomes.
- 36. Contacts Olivier COURTIN olivier.courtin@oslandia.com www.oslandia.com