Ideas for low coherents areas?

Microwave Toolbox Interferometry
#1

Dear fans of intefereometry

I have successfully modelled several earthquakes using Snap and Sendinel satellite data.
This has confermed for me that workflow that proposed here is valid and useful. :slight_smile:
So I tried to use same workflow on my Motherland there more than 50% is coverd by forest and 30% by swamps.
And problems are coming as expected. First, the intefereograms are not so beautiful any more. In picture up is seen filtered displacement intefereogram(scene is ~20x30km). After unwraping it looks like above. ther displacements are near half meter. This is not rear, this is common result. And for my geodetical mind say that this is wrong. But why? Are presented intefereogram worth of unwraping? If look the intefereogram then quite homogenius phase areas are settlements there coherentce are good >0.8. other are pure Nature. So I hav bit lost :frowning: that to do
Do you have some ideas

Question.jpg1215×933 260 KB

#2

Might be you could segment your scene spatially, this is the first solution, and then try to segment your scent temporally and this is the second solution.

So in this case spatially process a few burst instead to process the whole IW.

#3

How small segment I may go? For exsample are scene 100x100 pixel valid for unwrap?

#4

In this case as I pointed out you could corr. two or three bursts as maximum, and also try to use Sentinel 1B if it covers your study area.

#5

Does anyone have paper or algorithm for remove trend such cases?

#6

Hi,

Might be this article is helpful?

Temporal Decorrelation in L-, C-, and X-band Satellite Radar Interferometry for Pasture on Drained Peat Soils