I am trying to process ERS data from 1995 to create an interferogram. However, the coregistration does not seem to be working correctly. Furthermore the TopoPhaseRemoval won’t work (Error: Null).
If someone had managed to process some ERS products with SNAP, please help !
The chain I am following is:
apply orbit file
I tested the different coregistrations (DEM-assisted and normal) and inside the coregistration I have tested with and without the apply fine registration for SLCs but I obtained the same. For the other parameters do you have some suggestions ?
Use the shortest possible repeat-cycle and images from a dry period so the situation is more stable. If there’s any ERS-1/2 Tandem data with 1-day temporal baseline that would have much higher coherence than the standard 35-days for ERS.
Hello to all,
I’m experiencing a similar issue,
I’m studying the 2001 Buhji earthquake and I want to generate DEM from ERS data.
I fail in the “standard” coregistration processing. In particular the slave image is always empty (I followed the NEST tutorial downlodable in this link: https://earth.esa.int/web/nest/news/-/article/dem-generation-with-nest). Here a screen of the empty image:
The perpendicular baseline of 2508 m seems strange. Maybe something went wrong during the application of orbit files (similarly reported here).
Can you please test the InSAR stack overview also for the two input products before application of the orbit files?
The tutorial is rather old. Maybe you want to compare these two as well.
yes, please check if all pairs have these odd baselines or if it is maybe one faulty metadataset which causes this large value.
Still, if both images are acquired from the same track, coregistration should be possible. Have you tried DEM-based coregistration with cross-correlation?