A system for monitoring a feature of a surface with broad swath and high resolution

A system for monitoring at least one feature of a surface combining Delay Doppler Complex maps obtained from a Global Navigation Satellite System component (e.g. GNSS like Galileo, GPS, Glonass and Augmentation systems, including ground pseudo-lites, or future Earth-bound or planet/space-bound navigation/positioning/communication systems) or an other satellite system indirectly from one or more receivers and/or multiple emitters and/or several observations and/or frequencies and/or polarizations and means for deriving from said reflected signals said feature to be monitored.