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.
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