“…Simple GIS overlay of digital terrain data or remotely sensed vegetation data with digital soil maps often results in poor estimates of the co-occurrence of these variables.' However, it is still reasonable to assume the existence of inherent linkages, as well as certain spatial correlations, between landform classification and soil maps, because soil map production relied heavily on the traditional soil-landscape model (Soil Survey Staff, 1951, 1999Hudson, 1990Hudson, , 1992. Figure 3 shows the results of comparing the soil map (Figure 1(b)) and landform classification maps (Figure 1(c)).…”