Inquiry About Using VSM Without GPS Data

[keepfighting666]

hello, in the tests.pdf file, you mentioned that NA and BI represent different weight settings for InSAR and GPS data. I would like to know if it is possible to use the VSM tool effectively if GPS data is not available. Due to data acquisition issues, I have not yet obtained GPS data for my study area. I would like to know if it is possible to use the VSM tool effectively without GPS data. Additionally, my study area is covered only by a single Sentinel ascending orbit, so I can only obtain one-dimensional LOS observations. Could you please clarify whether the model can still function in such a case and if there are any specific considerations or adjustments needed?
Thanks a lot.
Best regards
Lijuan

[EliTras]

Of course you can. You need just one dataset to do the inversion, for example your single Sentinel ascending orbit. No weights are needed in this case.
Since you are using 1-dimensional data, consider that it is a limited constrain for your model.

[keepfighting666]

Dear Dr. Trasatti,
Thank you for your response regarding the limited constraints of using 1-dimensional InSAR LOS data in model inversion. Could you please elaborate on what specific constraints can be applied to address this limitation? Would source depth and source geometry (such as assuming a spherical source for the salt cavity or source depth) also qualify as the type of constraints you mentioned? I understand these could serve as prior information in parameter inversion process.
Additionally, if GNSS data becomes available, how would you suggest incorporating it as an additional constraint to improve the model’s robustness?
Best regards
Lijuan