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Spatial Databases

SpatiaLite & PostGIS. Spatial Databases. Spatial Databases. An ordinary database has strings, numbers, and dates. A spatial database adds one or more additional types for representing geographic features. The basic geographic types are: GEOMETRY (abstract superclass)

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Spatial Databases

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  1. SpatiaLite & PostGIS Spatial Databases

  2. Spatial Databases An ordinary database has strings, numbers, and dates. A spatial database adds one or more additional types for representing geographic features. The basic geographic types are: • GEOMETRY (abstract superclass) • POINT (a single coordinate, usually but not necessarily two dimensional) • LINESTRING (a set of two or more coordinates, with a linear interpretation of the path between the coordinates) • LINEARRING (a linestring of three or more coordinates in which the start and end points are the same, usually used to build polygons) • POLYGON (a set of one or more closed linearrings, one exterior ring that defines a bounded area, and a set of interior rings that define exceptions (holes) to the bounded areas) • MULTIPOINT (a set of points) • MULTILINESTRING (a set of linestrings) • MULTIPOLYGON (a set of polygons) • GEOMETRYCOLLECTION (a heterogeneous set of geometries)

  3. SpatiaLite • Spatially enables SQLite • SQLite is a simple, robust, easy to use and really lightweight DBMS • Each SQLite database is simply a file • You can freely copy it, compress it, put it on a network • They are also portable; the same database file will work on Windows, Linux & MacOS

  4. SpatiaLite • Can be read by QGIS • Analogous to an ESRI File Geodatabase • Comes with a standalone executable GUI tool • Can import and export ESRI shapefiles

  5. PostGIS • Spatially enables PostgreSQL • PostgreSQL is a FOSS robust enterprise relational database • Analogous to ESRI's Spatial Database Engine (SDE) • Developed by Refractions Research • Released in May 2001

  6. PostGIS • PostGIS data can be used by: • QGIS • UDIG • GRASS GIS • MapServer • GeoServer • OGR • ArcGIS

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