I am researching the use of coherence for agriculture.
Using the 2021 and 2022 SLC products, I performed the processing which looks like this:
- Apply orbit file
- Back geocoding
- Coherence estimation with 20x5 window size
- Terrain correction
The results I got for the 2021 and 2022 data were very promising, but when I processed the 2023 SLC products, the coherence either remained very low throughout the entire period, or it was completely random.
I’ve already double-checked for any possible processing errors. All processing for previous years was done before November 2023. I’ve noticed that there have been some changes to SNAP recently because I couldn’t download the orbit file, but the update fixed the issue.
Have there been any significant changes to any of the processing steps recently?
Or have there been any changes to the SLC products in 2023? To be honest, I’m running out of ideas, I know that precipitation can lower the coherence, but I don’t think that’s the problem here, it’s also the problem for all 4 tracks I’ve created coherence maps for.