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Preprocess of Agricultural land Gradation and Appraisal Factor——A Case of Agricultural Land Gradation in Xinyang City

YU Kun,PAN Yuan-qing,LI Tian-ge,GUO Yan(He'nan Academy of Country Resource Sciences,Zhengzhou 450053,China)  
Taking the agricultural land gradation and appraisal of Xinyang City in He'nan Province as an example,the preprocess of agricultural land gradation and appraisal factor was discussed.It provided the basic data for the factor calculation and agricultural land gradation and appraisal.
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