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PostGIS for Enterprise

Jody Garnet

Thanks to:Simon Greener

Paul RamseyMark Leslie

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What is a Spatial DatabaseSpatial Data TypesSpatial IndexingSpatial Functions

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What is a Spatial Database?Spatial Data Types

Pointa single coordinate of two to four dimensions

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Line StringSpatial Data Types

Linestringa set of two or more coordinateslinear interpretation of path between coordinates

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Linear RingSpatial Data Types

Linearringa linestring with three or more coordinatesthe start and end points are the same

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PolygonSpatial Data Types

Polygona set of one or more linearringsone ring defines the exterior boundaryremainder defines the holes in the polygon

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Multi GeometriesSpatial Data Types

Multi-geometries (Multipoint, Multilinestring, Multipolygon)a set of like geometries

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Spatial IndexingSpatial Data TypesSpatial Indexing

R-treeQuadtreeGrid-based

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Spatial FunctionsSpatial Data TypesSpatial IndexingSpatial Functions

ConstructionSerialisationPredicatesAnalysisAccessorsBuildersAggregates

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Total Length

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ST_Intersection

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ST_Intersection

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ST_Buffer

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ST_Buffer

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ST_SIMPLIFY“Denormalisation” of feature types into multiple tables based on

known or expected access patternsRoads are visualised with different style classes and

rendered at different scales

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Spatial Extensions for PostgreSQLSpatial Extensions for PostgreSQL

Provides Spatial Data TypeProvides Spatial IndexingProvides Spatial Functions

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PostgreSQL for SpatialSpatial Extensions for PostgreSQLPostgreSQL Extensions for Spatial

ACID transaction guaranteesEnterprise reliabilityCrash recoveryHot backupReplicationSQL support

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PostGIS History• Developed in 2001 by Refractions Research– to assist Refractions in their data processing tasks

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Growth• Initially just an indexed load-store extension to allow

concurrent access to data• Functions added based on Simple Features for SQL

(using GEOS which is a port of JTS)• PostGIS 1.0 provided fast / lighter Geometry object

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PostGIS Roadmap• Geography objects (spherical geometries)• Raster-in-db• curved geometry support• News update - PostGIS is now in OSGeo

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PostGIS ClientsYear Support2001 MapServer, OGR2002 GeoServer, QGIS2003 Safe FME200420052006200720082009 MapInfo, GeoConcept

Ionic Red Spider, OSSIMCadCorp SIS, GRASS, uDig, OpenJUMPESRI Interoperability Extension, gvSIGESRI ArcGIS Server, Manifold, GeoDjangoFDO, MapGuide, AutoCAD MAP3D

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Institut Geographique National, FranceNational mapping agency of FranceStores high-res topographic data

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GlobeXplorer• Provides web-based access to petabytes of imagery• PostGIS is used to manage metadata and search for relevant

imagery

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LISAsoft

ServicesServicesPostGISGeoServer

PublicationPublicationTileCache

Data ServiceData ServiceSnapMapsStore LocatorReverse Geocoder

Mobile ApplicationsMobile ApplicationsBuddy Finder Mokbee

• (my employer!)

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Team CIMAR : DARPA Grand Challenge

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Standards• Level playing field– Open Geospatial Consortium– International Standards Organization– W3C Consortium (XML/SVG)

• Simple Features for SQL / SQL Multi-Media Extensions

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Simple Features for SQL

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Implementations• Can DB handle 100M spatial features?• Spatial transactions• PostGIS? Yes• DB2? Yes• Oracle? Yes• SQL Server? In progress• MySQL? no!

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Enterprise