Spatial data is always represented in a spatial / coordinate reference system. While most data, e.g. from GPS sensors, is represented in WGS84 (LatLon) this is not always the case.

Currently geometries in rust-geo have no information about a coordinate reference system. This allows to compare a LatLon- Point with an UTM- Point.

In JTS and GEOS each Geometry has a CRS-id field. Algorithms have to check if the CRS of two geometries are the same. This could also be done for geometries in rust-geo.

Maybe it would also be possible to use the advanced type-system of Rust to add a generic CRS-type to geometries....