I have a question on the implication of polarimetric speckle filtering on a C2 matrix (i.e. from an S1 SLC), specifically in times series application.
In the attached Lecture notes by the esteemed Pottier, Lee & Ferro-Famil, bottom of pg.16, the subheading “Consequences of polarimetric speckle filtering”
…is described how a polarimetric filtering ‘decouples’ phase from canonical scattering mechanisms.
If understand correctly, this means that polarimetric methods such as h-alpha decomposition & classification are not sensible as the phase is no longer related to a specific scattering mechanism (please correct me if I have misunderstood).
I generally like using the polarimetric speckle filter, but I work a lot with time-series, namely change detection, so my question is, are two C2 matrices still comparable after pol-spk filtering? Or is the phase altered inconsistently.
I am hoping that if the phase alteration is consistent, then relative comparison between images still holds, even though absolute comparison to scattering mechanism is not.
Thanks for your insight