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Nonlinear subsidence rate estimation using permanent scatterers in differential SAR interferometry

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3 Author(s)
Ferretti, A. ; Dipt. di Elettronica ed Inf., Politecnico di Milano, Italy ; Prati, C. ; Rocca, F.

Discrete and temporarily stable natural reflectors or permanent scatterers (PS) can be identified from long temporal series of interferometric SAR images even with baselines larger than the so-called critical baseline. This subset of image pixels can be exploited successfully for high accuracy differential measurements. The authors discuss the use of PS in urban areas, like Pomona, CA, showing subsidence and absidence effects. A new approach to the estimation of the atmospheric phase contributions, and the local displacement field is proposed based on simple statistical assumptions. New solutions are presented in order to cope with nonlinear motion of the targets

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:38 ,  Issue: 5 )

Date of Publication:

Sep 2000

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