Failed interferogram


I am very new to InSAR, but I can tell that something is wrong with my interferogram. Here are the steps that I took with my two Sentinel-1 datasets:

Used S-1 TOPS Split to select the bursts I need.

Used the Apply Orbit File operator.
POD was only available for one image, the other image used restituted orbits)

Used S-1 Back Geocoding operator to coregister the two split products based on the orbit information

Finally, I used the Interferogram Formation operator, which gave me results that appear to have failed.

Does anyone have suggestions on what could have gone wrong/any steps I need to add to produce a more accurate interferogram with my two Sentinel-1 datasets?

Looks like the temporal baseline is too large. What’s the acquisition date of both images?
Also, vegetation cover leads to bad interferograms.

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@ABraun The acquisition dates are from 2017 and 2021. What would be an ideal time range for InSAR? Does it have to be from the same year?

This is way too long for single-pair interferometry. Please consider that any movement at the ground (e.g vegetation, water, crop growth, urban development…) leads to decorrelation of the phase. To get a clear interferogram with nice fringes you need

  • short temporal baselines (6 or 12 days)
  • bare ground or sealed/solid surfaces
  • no rainfall during any of both images