Here I have a question about the explanation of displacement. What does this displacement stand for if there is no water vapor effect?
Since an early version of DEM was used, does the result stand for displacement from Sentinel observation date T1 to Sentinel observation date T2? The phase removal from the early version of DEM may not remove DEM phase on Sentinel observation date T1 . I think we have this common problem when using SRTM data which was collected about 17 years ago.
Or some displacement related to error of DEM was also included? How to evaluate which one is the primary contribution to the final displacement results? Any suggestions?
Additionally question is also about DINSAR, will the result reverse if I reverse the sequence of master and slave image of Sentinel-1 IW SLC data? What is the correct sequence? I usually saw the master image was observed earlier than the slave image.
Any reply is highly welcomed.