Abstract
This paper presents a combined GIS (Geographical Information System) and constraint satisfaction approach to map soil hydrological properties from information contained in a small scale (1:250,000) pedological map. The regional soil databases available at this scale are rather imprecise. Because of the lack of reliable statistical data the imprecision is represented in a possibility theory framework. For every point in the covered area, an identification of the more or less possible soil typological units is computed. For each candidate soil typological unit the water storage capacity is computed by using constraint satisfaction techniques that implement fuzzy interval calculus on interactive variables. The method returns a map of the water storage capacity that accounts for the imprecision of the processed information.
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