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Sentinel-1,a two satellite constellation,is proposed and operated by European Space Agency(ESA)with prime objectives of Land and Ocean monitoring.The first satellite of the constellation,Sentinel-1A,was launched on 3 April 2014,21:02:00 UTC.And its “sister”,Sentinel-1B,is scheduled for 2016.The mission of Sentinel-1 is also equipped with C-SAR(C-band Synthetic Aperture Radar)like ERS-1/2 and Envisat.The Sentinel-1 is with the goal for providing C-Band SAR data continuity following the retirement of ERS-1/2 and the end of the Envisat mission.