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Market comparison approach is one of the commonest appraise approach. This paper studied real estate decision support system of market comparison approach based on GIS. Firstly, the paper designs the system logic structure in this paper, secondly, the paper establishes the database and model database for appraise, and then, the paper designs the system function, finally, and takes the Ganzhou as an example, develop and realize the system. By applying the system, the result showed that the system can control each process of market comparison approach, reduce the influence of subjective factor, thus make real estate appraises more scientific and let the appraised result more credible.
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