Problem with Interferogram Creation

[ABraun]

Do you both use images of the same track?
Were orbit files applied?
If the image doesn’t have enough significant patterns, the coregistration fails and no interferogram can be generated from this stack.

I highly recommend using the S1 TOPS coregistration module instead of single steps or the graphs you mention.

Some hints on getting correct coregistrations:

Flood Map using GRD

Did you apply orbit files before coregistration? You can increase the number of GCPs and change the window sizes. In general, the images which you want to co-register should not be too small so that a sufficient number of GPCs can be found throughout the image. Otherwise, you can download the SLC products and use the S1 TOPSAR coregistration. It allows for the definition of sub-swaths and bursts and produces correct results most of the time.