The Dimensionally Extended nine-Intersection Model (DE-9IM) is a topological model and a standard used to describe the spatial relations of two regions (two geometries in two-dimensions, R²), in Geometry, Point-set topology, Geospatial topology, and fields related to computer spatial analysis. Since the spatial relations expressed by the model are topological they are invariant to rotation, translation and scaling transformations.

The Dimensionally Extended nine-Intersection Model (DE-9IM) is a topological model and a standard used to describe the spatial relations of two regions (two geometries in two-dimensions, R²), in Geometry, Point-set topology, Geospatial topology, and fields related to computer spatial analysis. Since the spatial relations expressed by the model are topological they are invariant to rotation, translation and scaling transformations.