Study on Land Use Suitability Assessment of Urban-rural Planning Based on Remote Sensing—a Case Study of Liangping in Chongqing

Land use suitability assessment is an important fundamental work in urban-rural planning. Be restricted by technology and means, qualitative analysis methods be wider used in evaluating land use suitability in most districts of China. This method can’t impersonally and Quantitatively indicate the difference in land use suitability, and make urban-rural planning more subjectively because the influences on land use suitability are in many aspects and the impacts on objective evaluation are different. It is necessary to explore a land of urban-rural planning quantitative evaluation method to provide a reliable basis for the in-depth analysis of urban-rural planning and improve the persuasiveness of the decision-making and objectivity and science of the urban-rural planning. The rapid development of remote sensing technology and gradually maturing of GIS technology applications provides the foundation for urban-rural planning from the qualitative analysis to quantitative analysis.The core technology of the urban-rural planning is land use suitability comprehensive evaluation. Land use suitability assessment is the progress in which on basis of relevant natural, economic, social and technical data, using GIS, RS and other methods we do an individual assessment for every impact factor on the protection and development, and then make a comprehensive congruence analysis to the factor by the most optimal allocation principles and finally derive the rational allocation program of various elements and resources. Through the evaluation method, we can clearly determine the space relationship of "strict protection appropriate protection general use optimal use key development" in different policy conditions, so as to provide a solid theoretical foundation and serviceable content for urban-rural planning.The use of remote sensing technology, GIS technology in land suitability evaluation is a new technology and a new method in urban-rural planning. This thesis takes use of remote sensing and GIS technology to study urban-rural planning land suitability comprehensive evaluation. Taking Liangping of Chingqing for example, we acquire Liangping land use information through land use interpretation of 2006 TM image and the natural limiting factor, the factor of economic construction, ecologically sensitive factor, ecological protection factor which affect land suitability evaluation through GIS analysis. The natural limiting factor includes terrain factor and landscapes factor; the factor of economic construction includes town factor and traffic factor; the ecological protection factor includes basic farmland protection factor, nature reserve and scenic area factor and drinking water source protection factor. These factors are acquired from remote sensing technologies and GIS analysis.Through remote sensing image interpretation results, residential area is be extracted. On basis of the characteristics of population distribution, using the natural impact factors (terrain) and socio-economic impact factors (Towns scale, the distance from the town, the distance from the main network traffic), the population on the grid is discreted by spatial analysis functions of GIS. Through analyzing the various factors which impact on land suitability and the distribution of population, we determine the weight of the various factors which impact on the development of urban-rural, evaluate the land use suitability to determine the direction of urban-rural. These provide the scientific basis for planning.