Integration of tomographic SAR inversion and PSI for operational use

Persistent Scatterer Interferometry (PSI) is a special case of tomographic SAR Inversion and has advantages of 1) computational efficiency and 2) direct access to the phase histories independent of the motion models. However, it is restricted to single scatterers. Tomographic SAR inversion, on the other hand, delivers more information such as the number of scatterers, topography and motion information of layover areas. However, it is computationally more expensive, especially when high elevation resolution is required. For practical data processing, the combination of the efficiency of PSI and the information gain of tomographic SAR could be very helpful. In this paper, we address the integration of tomographic SAR inversion and PSI for operational use.