PostGIS is an open source software program that adds support for geographic objects to the PostgreSQL object-relational database.

• PostGIS follows the Simple Features for SQL specification from the Open Geospatial Consortium (OGC).
• Geometry types for points, linestrings, polygons, multipoints, multilinestrings, multipolygons and geometrycollections.
• Spatial predicates for determining the interactions of geometries using the 3×3 DE-9IM (provided by the GEOS software library).
• Spatial operators for determining geospatial measurements like area, distance, length and perimeter.
• Spatial operators for determining geospatial set operations, like union, difference, symmetric difference and buffers (provided by GEOS).
• R-tree-over-GiST (Generalised Search Tree) spatial indexes for high speed spatial querying.
• Index selectivity support, to provide high performance query plans for mixed spatial/non-spatial queries.
• For raster data, PostGIS WKT Raster (now integrated into PostGIS 2.0+ and renamed PostGIS Raster)

LHNAV can assist you with POSTGIS integration with QGIS

Converting data to PostGIS

Setting up Views and Queries and other Training