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This letter presents an analysis of two synthetic aperture radar (SAR) images time series over a Sahelian area, which is located in the Gourma region, Mali. The first one is acquired at the C-band by the Environment Satellite–Advanced SAR sensor in wide swath (WS) mode and the second one at the L-band by the ALOS–Phased Array-type L-band SAR in fine, dual, and WS modes. A change detection method based on random projection and the hue–saturation–value 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 the 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, i.e., the only temporal changes occurring over temporary or permanent ponds. [ABSTRACT FROM PUBLISHER]