The Research On Key Technology Of Landscape Pattern Optimization Based On GIS

With the process of urbanization in China, problems of intensity of the regional land use conversion and excessive concentration of population have gradually become important factors leading to ecological and environmental problems. Urban sprawl leads to fragmentation of living environment, which objectively cuts off the links of the ecosystem in the region; similar landscape patches isolated from each other. Material, energy and information flow are blocked and the ecological decline, which all eventually lead to degradation of the ecosystem.Under the guidance of landscape ecology theory and using technology of remote sensing (RS), geographic information system (GIS) spatial analysis and mapping technology, taking Chaoyang District, Beijing as a research area, this thesis summarizes and put forwards the key technical methods of the landscape pattern optimization, which include evaluation of landscape ecological pattern based on landscape functional connectivity and key component of recognition and analysis techniques of landscape pattern optimization based on the cumulative spend distance model The innovation of this thesis can the be summarized as the following aspects:For landscape connectivity distance, instead of blindly calculating a Euclidean straight-line distance of two plaques, we appropriately consider the elements of ecological processes and landscape resistance, as a core of accumulative cost distance model, on the basis of GIS spatial analysis function, We explicitly calculated curve connection distance. The result of calculation curve connection distance could be used to be the parameters of landscape functional connectivity. Taking connectivity degree of the curve to connect from the calculation results as a parameter of the investigation on landscape function, this thesis filters the landscape functional connectivity from the threshold. Under the constriction of the distance threshold of600meters, we evaluate the landscape pattern from the perspective of landscape functions connected. Based on the recognition of key component of landscape optimization pattern, we make quantitative analysis of landscape pattern optimization component, which has guiding significance to the actual ecological planning and building activities. This thesis achieves the above-mentioned technical process and put forwards programs of landscape optimization of the research area.