Detecting land deformation in the area of the Northern Bohemia using InSAR stacks (preliminary results)

摘要

The area of Northern Bohemia contains a large amount of brown coal and also other minerals. A large area is covered by open mines, but there are a lot of smaller old mines, usually abandoned. The Earth crust is very unstable there, which was confirmed by the first InSAR project, processed during 2004-2005, where only three ERS-1 SAR scenes were processed with the temporal baseline of 70 days.However, such a small amount of data does not allow to draw even qualitative conclusions. This time we process four data stacks with relatively short perpendicular baselines, in order to find out something about the geological processes happening there. The actual area of the open mines cannot be investigated by radar interferometry due to huge changes causing decorrelation, and the same holds for large areas in the reclamation process.On the other hand, the last InSAR project showed that the decorrelation in the investigated area is not as bad as expected, and new scenes acquired also in summer and spring are ordered. The area contains several cities, undermined in last centuries, and therefore coherence is expected to be good in these areas even in the cases of large temporal baselines.The interferometric results are then compared with in situ measurements.