The PSInSAR technique, invented by Ferretti et. al. , ,  ten years ago, meanwhile has proven its capability for
very precise measurement of surface deformations. To achieve this, the influence of the atmospheric phase screen (APS)
has to be removed. We investigated the APS for two series of TerraSAR-X high resolution spotlight data of a scene in
Bavaria. In order to account for stratified troposphere and turbulence we augmented the APS estimation of StaMPS
(Stanford Method for Persistent Scatterers) , that is we consider the APS as composed of a phase ramp, a part
stratified with height and a turbulent component. The turbulent component is estimated via kriging. The necessary
variograms can be computed under the assumption of isotropy as well as allowing for anisotropy. For short distances the
variograms show a regime which is not visible for lower resolutions. In this paper we discuss the choice of appropriate
variogram models with respect to our data.
Persistent Scatterers Interferometric SAR (PSInSAR) is a powerful method for measuring surface deformations with
millimeter-accuracy. Currently available algorithms are designed to detect large-scale earth movement or apply a
predefined movement model. The analysis of the displacement of corner reflectors on our test area required the
capability to detect localized deformation. To enable that, we modified StaMPS (Stanford Method for PS). We oppose
the modified algorithm to the original algorithm, using time series of TerraSAR-X data from our test area. The finding is
a distinct enhancement in the detection of localized deformation.