Applied Research Of GIS Technology In Planning Support Of Land Consolidation Project

Land consolidation is the comprehensive rectification for the fields, the waters, the roads, the forests and the villages in accordance with the overall land use planning which is the way to improve the quality of farmland, to increase the effective area of arable land and to improve the agriculture production conditions and the ecological environment. The process of the land consolidation involves a large number of the spatial information for the acquisition, the storage, the analysis, the management and the application. By the unique advantage of the scientific management and the comprehensive spatial analysis for the spatial connotation geography data to provide the information needed for the planning, the management, the decision-making and the research, Geographic Information System (GIS) is widely used in the land consolidation assisted planning and design. It can effectively enhance the scientific nature, the authenticity and the objectivity in the planning for the land consolidation project.On the basis of the scientific and technological results and the theoretical research obtained by the Group, this paper has made a more in-depth research of GIS in the application for the land consolidation assisted planning. By the application of GIS component technology and on the basis of the component product MAPGISSDK provided by the China-made software MAPGIS 6.7, the land consolidation assisted planning and design system MAPSTAR can be designed and realized under VC++ environment. The system includes the following seven functional modules—the data query, the graphics editing, the map storage management, the map layer management, the spatial analysis, the map output and the management of attribute data. GIS functional modules will be integrated effectively which is needed for the land consolidation assisted planning and design.Compared the difference for the suitability evaluation between the land consolidation and the territory above the county and taken eight factors with the representitation and the obvious distinction on the aspect of the topography, the soil conditions and the basic requirement as the evaluation index system, the evaluation index system suiting for the land consolidation is established. The weight of evaluation indexes is determined by combining AHP (analysis hierarchy process) with Delphi method (i.e. the combination of qualitative and quantitative methods). By this way, the sum method in mathematics can be used in the calculation of the index weight. Finally, people calculate the synthesis score value of the evaluation unit by"the weight sum"module to divide the appropriviate grade.With the support of the assisted design system MAPSTAR, this paper has conducted the empirical study taking the land consolidation project of Yunwu Dam in Guizhou Province as the example by the above-mentioned method. The result indicates that MAPSTAR raises the efficiency for the project's operation and improves the accuracy, the rationality and the scientific nature in the assisted planning effectively. The usage of AHP and Delphi method to define the weight of the evaluation index strengthens the scientific nature and the validity in the evaluation progress and can fully manifest each evaluation factor's influence degree. With the evaluation module"the weight sum"to calculate the synthesis score value for the evaluation unit, people can rapidly complete the calculation for more than 720 evaluation unit score in the project areas. This evaluation module has the characteristics of accuracy, high efficiency and scientific nature.