Investigate GACOS for atmospheric correction

[nackerley]

The aim here is to do a proof-of-concept for atmospheric correction using GACOS.

There are two components of an atmospheric correction that will be tricky to untangle (and we may not need to): 1) DEM imperfections (physical alterations of landscape or errors) - will be proportional to perpendicular baseline 2) Atmospheric variations - won't be proportional to perpendicular baseline

Questions

• Does GACOS perform well enough in our (high-relief!) regions of interest?
• Would height correlation, or some other simple model, work as well?
• What would an automated workflow incorporating GACOS look like?

Method

• reprocess some interferograms over a volcano (Edgecumbe or a volcano with higher relief?) with and without atmospheric correction
• metrics which should be reduced by a good atmospheric correction:
  • RMS of coherent phase
  • phase-altitude correlation coefficient
  • correlation distance (likely most difficult to implement)

[drotheram]

With renewed direction on the Policy on Sensitive Technology Research and Affiliations of Concern, integrating GACOS corrections into the InSAR workflow is likely unfeasible at this time.