I generated Interferogram from back-geocoding stack, which is combined with 12 SAR data from sentinel-1a. i have a problem, my interferogram is shown very much noise. I’m not sure that cause by not correlation of image or wrong process.
In this picture is shown paired interferogram between 2017-02-22 and 2018-02-17 compare with a landsat-8 image in the same area.
you are observing temporal decorrelation of the phase: Most of the surfaces have changed between the first and second image, especially vegetation, which leads to bad interferogram quality.
Persistent scatterer techniques, such as StaMPS, are based on a slightly different principle. They are more suitable to deal with temporal decorrelation, because only pixels with high stability are used. This however, requires the availability of a minimum density of usable points.