Persistent Scatterer Interferometry Using Adaptive Deformation Models

Because the quality assessment of Persistent Scatterers (PS) is dependent on the deformation model chosen, PS may be falsely rejected due to model imperfections. To accept these PS, more advanced deformation models should be used. However, the decreased rank of the estimation problem increases the chance of unwrapping errors. Therefore, advanced deformation models should only be applied when necessary. Two methods applying adaptive deformation models are proposed. They are based on a sequential scheme of alternative hypothesis testing within the integer least-squares framework. Application of the technique to a salt mining area in The Netherlands confirms the increase in the number of detected PS.