I am interested in using the coherence between 2 consecutive (6-day temporal baseline) Sentinel-1 images to look at the temporal changes of scatterers, or ‘phase noise’ as it is referred to in p.12 of the TOPS InSAR tutorial (https://step.esa.int/docs/tutorials/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial.pdf)
I’ve got my coherence image using:
Apply orbit files -> Back geocoding -> Interferogram (selecting ‘include coherence’)
But before going on to filtering, multilooking and terrain correction, I was wondering if in theory at least, including the below steps would help to better constrain coherence to these temporal changes in scatterers:
- subtract flat-earth (reduce effect of earth curvature)
- topo-phase removal (reduce effects of topography)
- remove thermal-noise (limit atmospheric effects on phase difference)
Any advice would be greatly appreciated!