SAR DATA Availability

Are there any SAR data other than Sentinel 1, Radarsat-2, Alosplasar, RISAT. For researching on SAR Data
Free data is preferable…

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Free TerraSAR-X data can be found here:
Applications could be: DEM generation, Surface Movement Monitoring, Land use, agriculture, forestry, Ground control points, ship detection etc.
Dual polarization data can be found here as well. Quadruple polarization has only been available for a short period of time in 2016: