Fast RTC approach for geocoded SAR products

I’m sharing our article on RTC correction of geocoded backscatter products that was recently published:

The key takeaways:

  1. Sentinel-1’s narrow orbital tube allows for the use of static RTC factors - this significantly reduces resources needed to perform RTC corrections
  2. A generalized framework for both InSAR and RTC as both these applications try to undo the effects introduced by difference in imaging geometry between acquisitions.
  3. A testing framework for RTC processors that uses actual SAR metadata but constant valued imagery. This allows for building unit tests for RTC with synthetic data.
  4. The testing framework identified issues in steep terrain with SNAP. This relates to various threads on this forum related to subsetting, use of single precision coordinates and DEM oversampling.