Simple Features
Simple Features are an OpenGIS standard which specifies digital storage of geographical data (point, line, polygon, multi-point, multi-line, etc) with both spatial and non-spatial attributes. Simple Features are based on 2D geometry with linear interpolation between vertices. In general, a 2D geometry is simple if it contains no self-intersection. The OpenGIS Simple Features specifications define various spatial operators, which can be used to generate new geometries from existing geometries.