River construction has the roles of control of smooth water flow, facilitation of a good environment for living things (animals and plants), and also the provision of healing and comfort effectiveness for people. We can apply Kansei Engineering to designing river landscapes to construct a natural environment for a river with the above-mentioned roles. It utilizes multivariate analysis to be applied to human evaluation to find design elements, but in this paper, we apply Nishino’s rough set model to the human evaluation data. The concern of this paper is to apply Kansei engineering to river landsca¬pe design, and to compare the data analyzed by multivariate analysis and by the rough set model. We obtained two factors through Factor Analysis: the first factor consisting of “beautiful”, “healing”, “good landscape” etc., and the second factor consisting of “natural”, “harmony with nature”, “good environment for living things” etc. We selected two Kansei words from the two factors obtained, “beautiful” and “good environment for living things”, and analysed these Kansei words using Quantification Theory 1 and the rough set model. We obtained very similar results for the design elements, but we learned from the lower approximation that combinations of design elements are more effective for designing.
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