Hello again @constantinevi and everybody that might be interested in this topic,
After several tests I made, I would really appreciate receiving your feedback regarding the “orbit interpolation degree” issue discussed above and the following outcome.
Two ALOS SLC FBS scenes in ascending mode, spanning the period 13/03/2008 - 20/12/2010, and having Bperp=140m, were processed.
Differential interferograms presented below are filtered, multi-looked and terrain corrected.
Fig1. Using “degree of flat earth polynomial”=5, “number of flat earth estimation points”=501, and “orbit interpolation degree”=5
Fig.2 Using “degree of flat earth polynomial=5”, “number of flat earth estimation points”=501, “orbit interpolation degree”=3
Do you still think that the 5th “orbit interpolation degree” could be safely selected in every pair processed? Several fringes of interest (bottom and top left circles) are not highlighted in the product generated using the 5th degree. In particular, the area at the bottom, is a known slow-deforming area.
On the other hand, it seems that topography was better removed in Fig.1 (orbit int. degree=5). Do you think that the fringes observed in the mountainous area (Fig.1, within the right circle) relate to atmosphere?
Looking forward to receiving your feedback!