Sentinel 1 data accuracy assessment

how one can do an accuracy assessment for sentinel 1 SLC TOPSAR data set.

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Hi, I suggest you have a read through Sentinel-1 documentation available at https://sentinel.esa.int/web/sentinel/user-guides/document-library. In particular I suggest you start with the 2015 S1-A Annual Performance Report available at https://sentinel.esa.int/documents/247904/1814124/Sentinel-1A-Annual-Performance-Report-2015 and then with the more recent N-Cyclic reports, the latest being available at https://sentinel.esa.int/documents/247904/2370914/Sentinel-1-N-Cyclic-Performance-Report-5-Cycle-77-80.

These reports describe the performance of S1-A in the various modes includes TOPSAR. Hopefully these will answer your question.