Discriminant analysis classification (DAC) and decision tree classifiers (DTC) were used for digital mapping of soil drainage in the\r\nBras-d�Henri watershed (QC, Canada) using earth observation data (RADARSAT-1 and ASTER) and soil survey dataset. Firstly,\r\na forward stepwise selection was applied to each land use type identified by ASTER image in order to derive an optimal subset of\r\nsoil drainage class predictors. The classification models were then applied to these subsets for each land use and merged to obtain\r\na digital soil drainage map for the whole watershed. The DTC method provided better classification accuracies (29 to 92%) than\r\nthe DAC method (33 to 79%) according to the land use type. A similarity measure (S) was used to compare the best digital soil\r\ndrainage map (DTC) to the conventional soil drainage map. Medium to high similarities (0.6 = S < 0.9) were observed for 83%\r\n(187 km2) of the study area while 3% of the study area showed very good agreement (S = 0.9). Few soil polygons showed very\r\nweak similarities (S < 0.3). This study demonstrates the efficiency of combining radar and optical remote sensing data with a\r\nrepresentative soil dataset for producing digital maps of soil drainage.
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