I’m using the following sequence to process Sentinel-1 IW SLC data:
Split > Orbit > Cal > Deburst > Pol matrices (C2) > Terrain Flatt. > Multilook
However, when I try to coregister the data with Back-geocoding I get:
Error: [NodeId: Back-Geocoding] Index 0 out of bounds for length 0
I’m sure this is an error message for the developers not for the users
Thanks for your support
Joao
@jun_lu can you have a look at this? Thank you!
Back Geocoding is for the coregistration of Sentinel-1 TOPS SLC products. The output of your processing chain has been debursted and is not a TOPS product. Therefore you cannot use Back Geocoding for the coregistration. You can use the coregistration operator under Radar > Coregistration. Or you can change you processing chain to coregister the images before deburst as shown in the graph below:
@jun_lu Thank you for your suggestion. My processing chain is not oriented towards generating an interferogram. My end product is a coregistered stack of terrain-corrected C2 images. I need this to run another algorithm outside SNAP.
So, after back-geocoding I need to Deburst > C2 > Filter > Multilook > Terrain Flattening > Terrain Correction
If I run the above sequence on the coregistered stack I will get duplicates of the first image of the stack. If I do a stack split after back-geocoding I think I will loose the metadata required to further process the data.
Sorry to confuse you. The graph is copied from an interferogram processing chain and I should remove interferogram from it. I just want to use it as an example to show you how to coregister two images before debuest. In your case maybe it is better to use the coregistration under Radar > Coregistration.
