Simple feature access
Simple feature access (SFA; also called ISO 19125), is both an OpenGIS and ISO Standard that specifies a common storage model of geographical data (point, line, polygon, multi-point, multi-line, etc.) using well-known text (or binary). The geometries are also associated with spatial reference systems. The SFA also specifies attributes, methods and assertions with the geometries.
In general, a 2D geometry is simple if it contains no self-intersection. The SFA specification defines DE-9IM spatial predicates and several spatial operators that can be used to generate new geometries from existing geometries.
External links
- OpenGIS Specifications (Standards)
- OpenGIS Simple Features Specification for CORBA (99-054)
- OpenGIS Simple Features Specification for OLE/COM (99-050)
- OpenGIS Simple Features Specification for SQL (99-054, 05-134, 06-104r3)
- OGR - OGR library which implements relevant OGC standards
- OpenGIS Simple Features Specifications For SQL
- MySQL 5.1 documentation on Spatial extensions
- PostGIS Simple Features implementation for PostgreSQL
Retrieved from : http://en.wikipedia.org/wiki/Simple_feature_access
