Thank you for giving some light on this. Because in SARPROZ or even in SqueeSAR results they provide temporal coherence of the PS points.
Anyway, I have one concern regarding the CSV file. I know that the first two export_res_XX correspond to the lon lat coordinates of the points. I just wonder if export_res_3 corresponds to the displacement for the first date? In the StaMPS Visualizer, there are 77 date-to-date points but in the CSV file, after the first two export_res_(1 and 2), I have 78 data points.
I got it. So export_res_3 corresponds to the mean velocity. I realized also that PS point no. in StaMPS Visualizer is PS point no. + 2 in the csv file (i.e., PS point no. 100 in StaMPS Visualizer is cell number 102 in csv).
Hi, @ABraun and @mdelgado! Just a quick question. I was trying to find the answer in some posts here but I don’t remember where I saw the same problem I have now.
I got one pair (from 60 pairs in total) with zero mean amplitude prior to launching matlab for PSI analysis with StaMPS. I proceeded and adjusted some parameters, and executed step 1. I got an error. I suspect it’s because of that pair with zero mean amplitude.
What I did is to remove that pair from the analysis. The PSI analysis was successfully completed. Was it okay to delete that pair with zero mean amplitude?
I agree with @mdelgado, the topic you are looking for was discussed e.g. here
If there are more cases of zero mean amplitude it is worth redoing the preprocessing in SNAP, this always solved the issue. I highly recommend checking the results after each preprocessing step to figure out such problems, since they often appear in the first steps.
Thank you for your immediate response. I’ve only checked a few interferograms in SNAP before the stamps_export through the snap2stamps tool.
I am tempted to redo it actually but I noticed that towards the end of the coregistration and interferogram generation process, it takes more than 4 hrs to finish 1 pair. In the early part of it, it’s relatively fast. I can redo it but I am sharing the PC with another person who uses the same PC for his own research also.
Anyway, thank you again!
Stay safe and healthy always.
PS: Fortunately, that pair that I removed is quite distant from the main event.
When using this software package please reference to this DOI (doi:10.5281/zenodo.1322353 ) and to the paper: M. Foumelis, J. M. Delgado Blasco, Y-L. Desnos, M. Engdahl, D. Fernandez, L. Veci, J. Lu and C. Wong. “ESA SNAP - StaMPS Integrated processing for Sentinel-1 Persistent Scatterer Interferometry”. IEEE International Geoscience and Remote Sensing Symposium. IGARSS 2018.
You may also add the reference to my zenodo:
Jose Manuel Delgado Blasco, & Michael Foumelis. (2018, July 27). Automated SNAP Sentinel-1 DInSAR processing for StaMPS PSI with open source tools (Version 1.0.1). Zenodo. http://doi.org/10.5281/zenodo.1322353