NDLI: Radar permanent scatterers identification in urban areas: target characterization and sub-pixel analysis

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2003 2nd GRSS/ISPRS Joint Workshop on Remote Sensing and Data Fusion over Urban Areas

IEEE/ISPRS Joint Workshop on Remote Sensing and Data Fusion over Urban Areas (Cat. No.01EX482)

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Radar permanent scatterers identification in urban areas: target characterization and sub-pixel analysis

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Radar permanent scatterers identification in urban areas: target characterization and sub-pixel analysis

Content Provider	IEEE Xplore Digital Library
Author	Ferretti, A. Colesanti, C. Prati, C. Rocca, F.
Copyright Year	2001
Description	Author affiliation: Dipt. di Elettronica e Inf., Politecnico di Milano, Italy (Ferretti, A.)
Abstract	Summary form only given, as follows. The permanent scatterers (PS) technique, developed by the authors during the last three years, allows the identification of radar targets particularly suitable for SAR interferometric measurements. In fact, despite its remarkable potential, spaceborne SAR differential interferometry (DInSAR) has not been fully exploited as a reference tool for ground deformation monitoring, due to the presence of atmospheric artifacts as well as geometrical and temporal phase decorrelation. Both drawbacks are overcome by using a multi-image framework of interferometric data (>30 images) in order to properly identify and exploit the subset of image pixels corresponding to coherent reflectors (PS). Whenever the sparse grid of PS is dense enough (more than 3-4 PS/km/sup 2/, constraint always satisfied in urban areas); accurate phase measurements carried out on the sparse PS grid allow one to compensate data for the atmospheric phase contributions. Average ground deformation rate as well as full displacement time series (both along the satellite line of sight, LOS) are estimated with millimetric accuracy on individual PS locations, fully exploiting the long temporal series of SAR, data available in the ESA ERS-1/2 archive. Therefore, the PS subset of image pixels can be seen as a high-density (100-300 PS/km/sup 2/, in urban areas) "natural" geodetic network. In this paper, we present some new results concerning the statistical characterization of the PS, both in terms of amplitude and phase returns. Moreover, it is shown how PS density can be significantly increased, in urban areas, by adopting a second-order model. Here, two individual scatterers per resolution cell are considered. Available data are then used to recover their reflectivity, elevation and LOS velocity. Problems related to over-fitting and model parameters estimation will be addressed. Results obtained processing 64 SAR images (ESA-ERS archive) acquired over Milan are shown. Finally, we present how PS can be exploited to carry out interferometric measurements using ERS-2 images acquired when the sensor was in emergency back-up mode (EBM). Both theoretical (signal processing) and practical issues are considered. First results obtained over Paris are discussed.
Sponsorship	IEEE/Geosci. & Remote Sensing Soc.
File Size	65758
File Format	PDF
ISBN	0780370597
DOI	10.1109/DFUA.2001.985725
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-08
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radar scattering Urban areas Spaceborne radar Synthetic aperture radar Interferometry Pixel Radar measurements Atmospheric measurements Particle measurements Monitoring
Content Type	Text
Resource Type	Article

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