NASA tutorial create the interferogram: https://www.earthdata.nasa.gov/learn/data-recipes/create-interferogram-using-esas-sentinel-1-toolbox phase-unwrap: https://www.earthdata.nasa.gov/learn/data-recipes/phase-unwrap-interferogram Skywatch tutorial create the interferogram: https://step.esa.int/docs/tutorials/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial_v2.pdf ESA SAR theory create the interferogram: https://esamultimedia.esa.int/multimedia/publications/TM-19/TM-19_InSAR_web.pdf
Skywatch tutorial https://step.esa.int/docs/tutorials/S1TBX%20DEM%20generation%20with%20Sentinel-1%20IW%20Tutorial.pdf