Land Comprehensive Evaluation Method Of Dimensionless Research Data

Based on the comprehensive evaluation theory and non-dimensionalization theory, according to the comprehensive evaluation theory, chose the reasonable comprehensive evaluation model, and according to the connotation of non-dimensionalization theory, research status and existing problems of all kinds of non-dimensionalization methods of consolidation and classified, and discussed the non-dimensionalization method of linear characteristics and application conditions.Through quantitative analysis method, with YongDengXian and GaoLanXian lanzhou for evaluation units from internal and external were selected slope, soil organic matter, irrigation assurance, cultivated land per capita and new farmland coefficient of establishing the land development, five indicators potential evaluation index system, and the different, according to the index attribute index into is moderate, meanwhile, application index poor regularization, maximizing, minimization, average, standard deviation of amination, rank times, and the proportion of seven linear non-dimensionalization methods index and data do non-dimensionalization processing, the determination of reasonable rank, to work out the non-dimensionalization methods do rank and rational rank rank correlation coefficient, and the comprehensive consideration various influence data non-dimensionalization result factor, for the non-dimensionalization method compared and optimization. Research conclusions are as follows:(1) with the trend of the index of processing, if indexes can be obtained directly by the original data, and can directly for conversion, do not need to use of the indicator of the positive, otherwise, may change the original index distribution condition and sequence changes, thus influence subsequent non-dimensionalization results and comprehensive evaluation result.(2) from the GaoLanXian YongDeng country and lanzhou city land development potential evaluation perspective, the original data non-dimensionalization method is different, the comprehensive evaluation results (sort) is different also, thereby, land development potential level is different also.(3) good index non-dimensionalization method should be maintained with the original data change trend overall consistency and uniformity, meanwhile, correlation coefficient calculated by individual extreme, and with "reasonable order" has a high correlation method.(4) according to the distribution of original data of original data of different, non-dimensionalization used different methods. Raw data larger than 1, the initialization, maximizing rank times non-dimensionalization method, the trend of the original data with kept good consistency; Original data in between 0 and 1, proportion of aging and homogenisation non-dimensionalization method relatively well.