Satellite-based radar can answer all of these questions.
Currently, only the Canadian company MDA, the German company Infoterra GmbH, and the Italian company e-GEOS operate commercial radar satellites. All three missions — RADARSAT-2, TerraSAR-X, and COSMO-SkyMed, respectively — have similar resolution modes. RADARSAT-2 captures data at “high-to-low” resolutions, while TerraSAR-X and COSMO-SkyMed capture data at high- to mid-resolution. U.S. operators of Earth observation satellites have not deployed radar instruments, opting instead to focus on higher resolution optical imaging. However, two U.S. companies, Fugro EarthData and Intermap, acquire radar imaging from aircraft.