Method For Connecting Gradation Database Of Agricultural Land And The Second National Land Survey Database In Yunnan Province

Firstly,this paper analyzes the differences between the two databases,findingtechnical issues needed to be addressed, including data format etc.Secondly, Secondly,the method was selected by analysis of and determine the spatial position relation ofgrade unit according to the system of Land classification of two databases. Finally,aCase of Xiangyun, testing the reliability of this method of convergence and accuracy.Xiangyun validation results showed that:(1) the part of quality grade、utilizationqualitt grade、 economic quality composte grade is same.The quality grade iscomposed by the9,10,11,12; utilization qualitt grade is Composed by the8,9,10,11,12;economic quality composte grade is composed by7,8,9,10,11.(2) The proportion ofarea of each grade. area ratio of quality grade ranged from less than7%; area ratio ofutilization qualitt grade ranged from less than6%; area ratio of economic qualitycomposte ranged from less than5%.(3) the spatial distribution of poor quality andbad agticulture remained the same. The area-weighted grade of10townships ofxiangyun County is not more than one grade except for yunnanyizhen, liuchang townand xiazhuang town.Verification results of Xiangyun County show that the method proposed by thearticle is creditable、accurate and feasible. And it can be applied to the complementwork of129County farmland Gradation results in Yunnan.