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Linear mixture modelling was applied to a multidate sequence of seven Landsat TM images of Chott el Djerid, Tunisia. This enabled proportions maps of four surface materials—gypsum, halite, clastic sediment and water—to be calculated. Mean patterns of these four surface materials were analyzed, and the modelling method also provided information on their spatial and temporal variability. Multidate mixture modelling has significant advantages over traditional image processing methods applied to Landsat Thematic Mapper imagery, in the context of mapping the sedimentological zonation on playas and in identifying active geomorphological processes.

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