Predictive mapping in a conventional way (the ITC approach, based on image-- mainly air photo-- interpretation and on mental landscape-soils' models) was tried in the PaSak area, and validated by quantitative soil pattern analysis (eg., heterogeneity, size and shape indices). On the other hand, the automated geopedologic approach, based on parameterization of the soil forming factors (clorpt) and their integration through applying decision trees was tried out in the Doi Ang Khang area, followed up by a statistical validation. Some of the shortcomings of both the conventional ITC approach and the automated geopedologic approach are dealt with. The conclusion, in short, is that predictive mapping is recommendable, but it can only be carried out by experienced soil surveyors, as a thorough knowledge of soil geomorphology -- understanding of soil spatial composition and the relations with landforms -- is a must.
Key words: Digital soil mapping, automated Geopedology, soil geomorphology, Upper PaSak, Doi Ang Khang, Thailand