Analysis of UMA data over DEM derivatives confirmed a number of aspects of the model e.g. the influence of slope shape on soil depth, but did not agree with some others. This illustrates some differences can occur when deriving attributes using the two techniques. For most soils, the differences were minor but for Waco, it was very significant. It is unclear why this occurred. Predictive modelling was hindered by two limitations.
Accelerated erosion is a significant feature of the basaltic uplands.
Soil depth in some areas has been reduced by more than one metre. This results in a greater than expected range of attributes e.g. slope for that parameter. The results of the analyses allowed revision and expansion of the Beckmann et al. Implementation of this model is restricted though, as a necessary attribute is substrate lithology - a dataset which is not currently available for the area. For further information regarding this project please contact Andrew Biggs.