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Analysis of L and C-bands SAR images time series over a Sahelian area

Abstract : This paper presents an analysis of two Synthetic Aperture Radar (SAR) images time-series over a Sahelian area, located in the Gourma region, Mali. The first one is acquired at C band by the ENVISAT - Advanced SAR (ASAR) sensor in Wide-Swath (WS) mode, and the second one at L band by the ALOS - Phased Array type L-band SAR (PALSAR) in Fine, Dual, and WS modes. A change detection method based on random projection and the Hue-Saturation-Value (HSV) transform appears to be very well appropriated to detect the temporal changes appearing on both data sets. The results illustrate the higher penetration depth of L band over such sandy soils. The C band time series is found to be very sensitive to surface changes (soil moisture and vegetation growth). By contrast, the L band time series appear to be very stable over the sandy soils, the only temporal changes occurring over temporary or permanent ponds.
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Pierre Louis Frison, Grégoire Mercier, G. Faye, E. Mougin, Pierre Louis Hiernaux, et al.. Analysis of L and C-bands SAR images time series over a Sahelian area. IEEE Geoscience and Remote Sensing Letters, IEEE - Institute of Electrical and Electronics Engineers, 2013, 10 (5), pp.1016 - 1020. ⟨10.1109/LGRS.2012.2227931⟩. ⟨hal-01058010⟩



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