Coherence Difference

Hello, everyone!

I just want to ask if it is possible to calculate the coherence difference between 2 interferograms directly using Band Maths in SNAP? I’ve loaded in SNAP the 2 terrain corrected coherence products and wanted to calculate the difference between the 2 but I couldn’t do it directly using Band Maths. I’ve attached here a screenshot of the issue I have.

Thank you in advance for your help.

You need the two images to have the exact same dimensions.
One solution is to collocate the images for example (raster >> Geometric Operations >> Collocation). You can also create a stack (Radar >> Coregistration >> Stacks Tools >> Create Stack).