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Journal of Applied Remote Sensing

Contribution of multitemporal polarimetric synthetic aperture radar data for monitoring winter wheat and rapeseed crops
Author(s): Julie Betbeder; Remy Fieuzal; Yannick Philippets; Laurent Ferro-Famil; Frederic Baup
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Paper Abstract

This paper aims to evaluate the contribution of multitemporal polarimetric synthetic aperture radar (SAR) data for winter wheat and rapeseed crops parameters [height, leaf area index, and dry biomass (DB)] estimation, during their whole vegetation cycles in comparison to backscattering coefficients and optical data. Angular sensitivities and dynamics of polarimetric indicators were also analyzed following the growth stages of these two common crop types using, in total, 14 radar images (Radarsat-2), 16 optical images (Formosat-2, Spot-4/5), and numerous ground data. The results of this study show the importance of correcting the angular effect on SAR signals especially for copolarized signals and polarimetric indicators associated to single-bounce scattering mechanisms. The analysis of the temporal dynamic of polarimetric indicators has shown their high potential to detect crop growth changes. Moreover, this study shows the high interest of using SAR parameters (backscattering coefficients and polarimetric indicators) for crop parameters estimation during the whole vegetation cycle instead of optical vegetation index. They particularly revealed their high potential for rapeseed height and DB monitoring [i.e., Shannon entropy polarimetry (r2=0.70) and radar vegetation index (r2=0.80), respectively].

Paper Details

Date Published: 11 May 2016
PDF: 19 pages
J. Appl. Remote Sens. 10(2) 026020 doi: 10.1117/1.JRS.10.026020
Published in: Journal of Applied Remote Sensing Volume 10, Issue 2
Show Author Affiliations
Julie Betbeder, Ctr. d'Etudes Spatiales de la Biosphère (France)
Remy Fieuzal, Ctr. d'Etudes Spatiales de la Biosphère (France)
Yannick Philippets, Ctr. d'Etudes Spatiales de la Biosphère (France)
École Nationale des Sciences Géographiques (France)
Laurent Ferro-Famil, Univ. de Rennes 1 (France)
Frederic Baup, Ctr. d'Etudes Spatiales de la Biosphère (France)


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