The radargrammetric equation follows a similar principle as the stereoscopic equation, except that it uses the radar geometry. The radargrammetric observation equation allows the retrieval of 3D information about a target, based on the determination of the sensor-object stereo model. It estimates the coordinates the intersection of the two radar rays coming from the two different sensor positions with different look angles, using the coordinates of the satellites position and satellite velocity. The radargrammetric equation can be adapted in order to retrieve 3D information in layover areas (e.g. urban areas).