NISAR is a realization of InSAR and SweepSAR techniques but done with dual radar frequencies with higher-frequency monitoring and precision.
replyTechnical details from ISRO - https://www.isro.gov.in/Mission_GSLVF16_NISAR_Home.html
Do you have any sources or even hints of sources that I could search for to back up the claim that this has been done for a long time?
replyFor example this: https://www.sciencedirect.com/science/article/abs/pii/S00344...
replySearch for 'land subsidence insar mexico'