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Proceedings Paper

Permanent scatterers in SAR interferometry
Author(s): Alessandro Ferretti; Claudio Prati; Fabio L. Rocca
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Paper Abstract

Differential SAR interferometry measurements provide a unique tool for low-cost, large-coverage surface deformations monitoring. Limitations are essentially due to temporal decorrelation and atmospheric inhomogeneities. Though temporal decorrelation and atmospheric disturbances strongly affect interferogram quality, reliable deformation measurements can be obtained in a multi-image framework on a small subset of image pixels, corresponding to stable areas. These points, hereafter called Permanent Scatterers, can be used as a `natural GPS network' to monitor terrain motion, analyzing the phase history of each one. In this paper, results obtained using 45 ERS SAR images gathered over the Italian town of Camaiore (within a time span of more than 6 years and a range of normal baseline of more than 2000 m) are presented. The area is of high geophysical interest because it is known to be unstable. A subterranean cavity collapsed in October 1995 causing the ruin of several houses in that location. Time series analysis of the phase values showed the presence of precursors three months before the collapse.

Paper Details

Date Published: 10 December 1999
PDF: 7 pages
Proc. SPIE 3869, SAR Image Analysis, Modeling, and Techniques II, (10 December 1999); doi: 10.1117/12.373150
Show Author Affiliations
Alessandro Ferretti, Politecnico di Milano (Italy)
Claudio Prati, Politecnico di Milano (Italy)
Fabio L. Rocca, Politecnico di Milano (Italy)

Published in SPIE Proceedings Vol. 3869:
SAR Image Analysis, Modeling, and Techniques II
Francesco Posa, Editor(s)

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