The characteristics of a soil information system based on the fuzzy relational database model as defined by Zemankova-Leech and Kandel are presented. The proposed system maintains all the advantages of the more conventional relational implementations but enhances them in two ways: (1) the system can cope with incomplete or even imprecise data; and (2) the users are allowed to express their subjective view of the stored data. The retrieval and processing of data approximately resemble the way that humans think and reason. The INGRES relational database management system was used for the implementation of the system.
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Kollias et al. (1991) studied this question.
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