Basic Farmland Demarcated Study Based On GIS

Cherish the reasonable use of every inch of land is the basic state policy of our country; Practice the basic farmland protection system is the important measure of national food security. According to the relevant provisions of the state of permanent basic farmland demarcated will shall degree is high, the water conservancy facilities condition is good, convenient geographical conditions of the existing cultivated land into permanent is shall practise a system of basic farmland protection of basic farmland and the important measures to safeguard national security. At the same time, because the second national land transfer Chad on the current situation of basic farmland layout has provided the perfect layout and scale number of underlying data source; So reasonable delimit the permanent use of geographic information system of basic farmland for rapid, accurate completion of permanent basic farmland demarcated work is of great significance.With JingZhou in hunan province as an example, this study used the analytic hierarchy method and based on GIS spatial analysis method of basic farmland demarcated. The main research result were as follows:Defined reference at this stage is the main theory and technology method of permanent basic farmland, on the basis of many working procedures and standards in combined with the practical work, and geographic information system in the application of the maintenance and management of basic farmland.Analyze JingZhou arable land and basic farmland change status:using the latest two adjustable data extract cultivated land and the land use updating investigation data distribution, as well as the natural geographical conditions of JingZhou; Drive to study the effects of cultivated land change, to determine significant impact factor and the significant factors affecting the cultivated land and the reference state technical standards on the basis of basic farmland demarcated selected evaluation index, evaluation index weight, to establish the evaluation index system. By using hierarchical analysis method and the geographic information system to build a evaluation model of basic farmland, then calculated the cultivated land plot for each rating index to comprehensive evaluation score; To analyze the evaluation results, according to the number of the protection of basic farmland and constraint factors determine the quality of permanent basic farmland.Through the study of permanent basic farmland demarcated JingZhou, determined by the selection of permanent basic farmland evaluation index and evaluation index weights to build a basic farmland evaluation system suitable for basic farmland demarcated JingZhou permanent job. Reached by the governments at JingZhou quantitative index of basic farmland and from the perspectives of comprehensive evaluation index is worth five permanent basic farmland demarcated can reflect the comprehensive index by the selected in turn part of cultivated land quality.