At The County Level Land Suitability Evaluation Based On GIS

Land suitability evaluation is in the past twenty years, one of the main content of theland resources research at home and abroad for the analysis of land use present situation, therevision of land use planning and rational development and utilization of land resources toprovide scientific and reliable basis.Based MiZhi county with northern shaanxi geomorphic characteristics of agriculturalland as the research object, based on land suitability theory research, studies and sums up theMiZhi county agricultural land unit types of restrictive factors and influence degree, make fulluse of GIS spatial analysis technology from MiZhi county land slope, slope direction,landform, soil, land use status, etc for multiple perspectives in the study area has carried onthe comprehensive evaluation of land suitability, and adopt the evaluation factors weightmethod for determining the "debugging method" to determine the weight of each factor in theevaluation, then draws MiZhi county the index synthetical index of land suitability evaluation,finally determine the suitability of land evaluation unit, in combination with the practicalsituation of MiZhi county, puts forward the main problems of the county land use as well asthe applicability of strong governance and reform measures for MiZhi county implementationof scientific management, reasonable utilization of agricultural land and land planningprovides a theoretical basis.Based on MiZhi county of YuLin city as study area, this paper to construct a reasonablesuitable for in the study area land use suitability evaluation method. The main researchcontent is as follows:1) based on the statistical data to establish the research area land use suitabilityevaluation index system, and using the analytic hierarchy process (ahp) to the study area ofland use suitability evaluation;2) under the GIS support, using spatial overlay analysis method, the evaluation ofdifferent types of land suitability degree of study area, and the suitability of the evaluationresults of classification and grading, spatial database of land use suitability evaluation results,the implementation of land use suitability evaluation of the spatial and attribute can bechecked;3) comprehensive statistical analysis of results and research area actual results, modification and verification the result of the spatial analysis, access to scientific andreasonable analysis and evaluation results, in order to achieve the sustainable management ofland resources to provide advice, to provide technical support for the land use planningrevision work.