Several indices were applied to generate DT algorithms to extract specified class from satellite imagery. Consequently, the Soil Adjusted Vegetation Index (SAVI) was used to extract vegetation information, as shown in equations (1) to (4); a Normalized Difference Bare Index (NDBI) was applied to select built-up areas; a Modified Normalized Difference Index (MNDWI) was presented to delineate open water features; and a Normalized Difference Bare Index (NDBal) for the bare land (Hua et al., 2012) was also used.