Study On Optimization For Basic Farmland Allocation Based On Grid Data

Basic farmland planning is one of the important parts of overall land planning, which is, according to certain norm, to select the chosen land in overall land planning as the basic farmland protection zones. In the process of compiling the distribution of basic farmland by overall land planning in the last round, due to the compiler's arbitrariness, the impact of backward technical means and the limit of lacking expected planning itself, the restrictions of the spatial distribution of basic farmland for non-agricultural construction have been increasingly obvious in last round. On the point of how to protect the limited arable land and basic farmland, the Ministry took a number of positive and effective measures, and to optimize the layout of basic farmland is one concrete manifestation.This paper takes Longtan town in Fuling district as an example, and raster GIS data model based on accurate data carriers, continuous expression of the situation, the character of easy-to-storage in computer, manipulation and display of volume data processing and features of powerful spatial analysis such as the use of AHP method to evaluate the quality of cultivated land, the weight factor of each index. The combination of these two methods, full use of GIS for overlay analysis and buffer analysis, spatial analysis functions and the ability to deal with attribute data, can effectively and objectively reflect the actual extent of land quality, which is a more scientific and objective classification and grading of land. This paper will re-layout the basic farmland in Longtan town in new round and analyze the results of layout. The detailed studies include the following parts:(1)On the theory of spatial layout of basic farmland, this paper probes the significance of the spatial layout of farmland, demarcates the significance of basic farmland, describes the layout of the relevant basic farmland Optimization space requirements and transferred to bring up the theory of basic farmland, farmland of the study area of present further analysis and study, then further analysis the factors of the layout of basic farmland in the study area. So with this basis, the paper puts forward a scientific and rational layout optimization ideas.(2) To describe the main methods of the current layout of basic farmland, the characteristics of raster data and the common spatial analysis methods in its relevant suitability analysis. Then based on the GIS spatial data modeling capabilities, it will demonstrate the advantages of GIS technology, especially the grid data in basic farmland layout.(3)To conduct a suitability evaluation on the basic farmland cultivated land; to establish the index system to determine the weights of evaluation indexes and indicators of the scores; with the spatial analysis function, to get the scores of each land polygon by analyzing weighted multivariate and ultimately to get the land suitability evaluation system of basic farmland. To order inversely the scores of the arable land polygons, and according to a new round of basic farmland distribution index in Longtan town, to divide the farmland whose total number of basic farmland value the target distribution into the new round of local farmland, so then to get a new Optimizated round layout of basic farmland in Longtan town.(4) To have a reasonable optimization spatial analysis of basic farmland, to analyze rationality of the quality and the distribution difference in the two rounds of basic farmland layout, and from the compactness, figure valve unit characteristics Index (the average area of polygons, polygon size standard deviation and polygon fractal dimension), to analyse the rationality and reliability of the landscape layout.