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This is a Haskell binding to Geos, the open-source geometry library. Capabilities include:

• Geometries: Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, GeometryCollection
• Predicates: Intersects, Touches, Disjoint, Crosses, Within, Contains, Overlaps, Equals, Covers
• Operations: Union, Distance, Intersection, Symmetric Difference, Convex Hull, Envelope, Buffer, Simplify, Polygon Assembly, Valid, Area, Length,
• Prepared geometries (pre-spatially indexed)
• STR spatial index
• OGC Well Known Text (WKT) and Well Known Binary (WKB) encoders and decoders. These can be used to parse PostGIS geometry types.