GAMMA Questions

Hi, Charles and eweryone!

I wanna try to use GACOS atmospheric model for interferometric data.
Do you have success cases for used it?
Am I understand correctly, that differences of two GACOS models for two sensing data need to (+) or (-) for unwrapped interferogram, before calculate displacements?
How I can do it "technically"? GACOS data - geotiff or Binary grid.

DOI: 10.1029/2020JB019562
"For SInSAR atmospheric correction,
you should make a difference between the delay maps of two dates. As a convention, please make sure
you always use the delay map at the later date to minus that at an earlier date."
"Once differenced both in space and time, you can simply apply tropospheric correction to your
geocoded interferograms by plus or minus the differenced atmosphere delays".