Synthetic Apertur Radar (SAR) Measurements provide information of surface roughness over the water-covered ocean. Principally spatial modulations of this roughness is related to changes in wind, but also secondary vertical circulation induced, e.g, through internal ocean waves or bottom topography in shallow areas. The surface roughness can also be influenced by surfactants (natural biological or man-induced). Accordingly all those parameters can be inferred from SAR measurements and respective work is ongoing.
Newly emerging is remote sensing of coastal partially dry regions, e.g. over tidal flats where methods of discriminating sediment types are being investigated. Also developed was recently a novel approach to monitor river run-off using INSAR technology.
The picture above shows the underwater bottom topography ate the coast of China.