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  • OGC Simple Features Specification for SQL Revision 1.1 conformant (non official but verifiable).
  • 2D Geometries supported: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, GeometryCollection.
  • Predicate functions: Equals, Disjoint, Intersects, Touches, Crosses, Within, Contains, Overlaps, Covers, CoveredBy, Relate, IsWithinDistance.
  • Spatial analysis functions: ConvexHull, Intersection, Union, Difference, SymDifference.
  • Linear referencing functions: LineInterpolatePoint, LineLocatePoint, LineSubstring.
  • Spatial relationship and processing functions: Distance, Length, Area, Buffer, Centroid, PointOnSurface, Simplify, Polygonize, LineMerge and many more.
  • Coordinate systems aware: SRID, SetSRID, Transform.
  • Spatial indexing: Simple but effective implementation using table-valued functions (FilterQuery, JoinFilterQuery, IsWithinDistanceQuery, RelateQuery)
  • Aggregate functions that overcome the 8000 bytes limitation of normal user-defined aggregate functions: UnionAggregate, EnvelopeAggregate, IntersectionAggregate.
  • GML support: AsGML function.
  • Import from shapefiles and PostGIS tables.


  • Export to shapefiles and PostGIS tables.
  • AsSVG function.
  • Support as data source by SharpMap rendering engine (already available in its latest source code package).

Last edited Jan 31, 2007 at 5:42 PM by rstuven, version 4


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