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Authors: Bonforte, A.* 
Ferretti, A.* 
Prati, C.* 
Puglisi, G.* 
Rocca, F.* 
Title: Calibration of atmospheric effects on SAR interferograms by GPS and local atmosphere models: first results
Journal: Journal of Atmospheric and Solar-Terrestrial Physics 
Series/Report no.: vol. 63
Publisher: Elsevier
Issue Date: 2001
Keywords: SAR
Tropospheric delay
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation 
01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques 
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy 
04. Solid Earth::04.03. Geodesy::04.03.08. Theory and Models 
04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
Abstract: A comparison between the ZPD (Zenith Path Delay), obtained from GPS measurements, and the expected delay, derived from models used to compensate tropospheric effects on SAR interferograms, is made. The results of the two methods are comparable, though the available data set is not large enough for a complete statistical validation of the methods. The results of this preliminary study suggest a possible integration of GPS-based ZPD data with cheap and standard meteorological data, since the estimated atmospheric component proved to be similar. Furthermore, the impact on volcanology of the effects measured by GPS, and in particular on the determination of the depth of the volcanic sources, is discussed.
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