Sources of Temporal Decorrelation in an Agricultural Scene and Their Effect on Sub-Daily Sar Coherence Time Series
Arturo Villarroya-Carpio (Universitat d'Alacant)
J. M. Lopez-Sanchez (Universitat d'Alacant)
A. Aguasca (Universitat Politecnica de Catalunya)
A. Broquetas (Universitat Politecnica de Catalunya)
Xavier Fàbregas (Universitat Politecnica de Catalunya)
Mireia Mas (Universitat Politecnica de Catalunya)
S.C. Steele-Dunne (TU Delft - Mathematical Geodesy and Positioning)
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Abstract
Data obtained during a ground-based SAR experiment and an associated field campaign have been exploited to study the rate and sources of decorrelation in an agricultural test site in the conditions of observation of a geosynchronous SAR. It was found that the scene is less affected by temporal decorrelation when the primary image is acquired during night time or early morning. Additionally, a periodic oscillation on a sub-daily scale was observed when creating coherence time series with increasing temporal baseline. Two factors which strongly contribute to these oscillations are the daily cycles of soil moisture and evapotranspiration.