Failed interferogram

Microwave Toolbox Interferometry
#1

Hello,

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?

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#2

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

1 Like
#3

@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?

#4

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