Study On The Grade-determination Of Cultivated Land Based On GIS

With the development of economy, the growth of t h e population and the fast expansion of the urban scale, the demand of land in Panyu district is rising rapidly and the quantity of cultivated land is reducing sharply, The contradiction between people and land is conspicuous day by day. In order to reasonably utilize and manage the limited land resources , realize the sustainable utilization of the land resource, guarantee the dynamic equilibrium of the total amount of cultivated land, realize the lasting sound development of social economy, and combine the nationwide work of putting the land in order, the project of grade-determination and appraise of agricultural land has been carrying on in Panyu district.This work is defined with the level of "The regulation of grade-determination of agricultural land "and "The regulation of appraise of agricultural land" which are issued by Ministry of Land and Natural Resources , and with the guide of "The technological projection on grade-determination of agricultural land in Guangdong Province " and "The working projection on grade-determination of agricultural land in Guangdong Province" . Ganging together with its reality and by using the method of combining data analysis with investigation , quantitative appraise with qualitative appraise , conventional technology with the GIS technology , we have collected the thematic data for grade-determination and evaluation of agricultural land .By scientific analysis of the real utilization , we have set up the index system for grade-determination and price evaluation and we have established the relative calculating and evaluating model and the GIS database , we carried out the grade-determination of agricultural land and finished the evaluation of standard land price symptomatic district in Panyu District.In this article, from the abstraction of cultivated land icon, the demarcation of the appraisal unit, the codification of the appraisal unit, the establishment of spatial and natural database of cultivated land and the calculating of related distance , I have ail-roundly introduced the application of GIS technology in the appraisal of cultivated land and the work of cultivated land appraisal based on GIS. By ascertaining the parameter and its importance of the cultivated...