DEM reconstruction with SqueeSAR

In SqueeSAR approach the coherence matrix (CM) is used to optimally estimate the time series of the optical ray-path values of each DS while preserving the information associated to point-wise PS. CM allows also to identify the so called Temporary Coherent Scatterers (TCS), targets whose SNR varies dramatically over time for which it is not possible to extract time series of motion. However, TCS can be exploited applying a ML estimation to retrieve average velocity and topographic residual, allowing to achieve a dramatic improve in points of measurement density. This approach is particularly useful to derive precise DEM of the area of interest.