Difficulty forming interferograms from ERS images

[ABraun]

the ASAR example you post would surely have coherence values > 0.6 through the whole image.

If you have much vegetation cover on the ground coherence decreases rapidly, mostly within days/weeks.

Subsidence map in 3d view

thank you, @heinzollerketchup. Generally, the longer the temporal baseline (=the time between two images) the higher is the decorrelation which leads to small coherence values. It also depends on the cover of the analyzed surface. Bare ground mostly shows slower decorrelation than one with high vegetation cover. As you can see here (tested with S1 data), coherence decreases from 0.7 to nearly 0.1 within 6 12-day-cycles (12, 24, 36, 48, 60 and 72 days, blue to red) [image] Source: http://ieee…