Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Concept to Analyze the Displacement Time Series of Individual Persistent Scatterers
 Paparoditis, N. ; International Society for Photogrammetry and Remote Sensing ISPRS: XXIV ISPRS Congress "Imaging today, foreseeing tomorrow", Commission III : 59 July 2021, Nice, postponed to June 2022 Istanbul: ISPRS, 2021 (ISPRS Archives XLIIIB32021) S.147154 
 International Society for Photogrammetry and Remote Sensing (ISPRS Congress) <24, 2021, Nice/cancelled> 

 Englisch 
 Konferenzbeitrag, Elektronische Publikation 
 Fraunhofer IOSB () 
 Persistent Scatterer Interferometry; time series analysis; Surface Deformation Patterns 
Abstract
Persistent Scatterer Interferometry (PSInSAR) exploits a time series of Synthetic Aperture Radar (SAR) images to estimate the mean velocity with which the surface of the earth is deforming. However, most PSInSAR algorithms estimate the mean velocities using a linear regression model. Since some deformation phenomena can exhibit a more complex behavior over time, using a linear regression model leads to potentially wrong estimations for the mean velocity. For example, the velocity of a landslide moving down a steep slope can change depending on the water content of the material of the landslide, or an inactive landslide can reactivate due to an earthquake. Both scenarios would not result in a time series with a constant linear slope but in a piecewise linear time series.
This paper presents a Matlabbased tool to analyze an individual Persistent Scatterer (PS) time series. The Persistent Scatterer Deformation Pattern Analysis Tool (PSDefoPAT) aims to build a mathematical model that sufficiently describes the time series trend and seasonal and noise components. The trend component is estimated using polynomial regression and piecewise linear models, while a sine function approximates the seasonal component. The goal is to identify the best fitting model for the displacement time series of a PS. PSDefoPAT is introduced by examine the time series of three different PS located in the region surrounding Patras, Greece. Based on the derived models, we discuss the nature of their deformation patterns.