Minimum Ecological Sites Range Space Extraction Method Based On Gis

The quantity of cities and urban population in the world are increasing quickly due to the developing of economy, that make the scale of urban land expanding gradually and demand more and more cities invading to the space of nature. The ecological environment is destroying seriously accompanied with the ecological land is dieing away. The sustainable development of ecology and environment is the base of regional sustainable development,while measuring the ecological land which keeping regional sustainable development require is the precondition to establish the Strategic Planning of Urban Development.Facing to the contradiction between developing urban economy and protecting ecological environment, we should know where the ecological land baseline is and allocate the ecological land in a high effect way. Only in this way can we guide the city planning and city constructing effectively and provide a fine base for the city/s sustainable developing.This paper set about from these fundamental problems, takes the minimum use of urban ecological land theory as basis, study the space model for extracting the minimum scope of ecological land and try it in resolving the problems mentioned.The thesis is consists of six sections.In the first section, I put forward the background,the specific destination and significance of the thesis, the preliminary idea and technological syllabus need to be used。In the second section, the origin of the minimum scope of urban ecological land, the academic foundation are summarized.And I labored the Forman's landscape planning idea, aggregate-with-outliers in this section. The third mainly introduced the model of the importance of urban ecological land evaluation, the way of extracting the minimum scope of urban ecological land and the technical support. The forth contain the content which use the technology of GIS to synthetically evaluate the importance of the ecological land in Shenzhen city.By doing the scenario analysis for diverse value of the ecological land scope,consulting some standard of the eco-city construction and the experience of some city's constructing in the world,we got the threshold value which Shenzhen should protect the minimum area of the ecological land is half of the Shenzhen area.Based on the result of the landscape comprehensive evaluation and the threshold value of the minimum area of the ecological land,the minimum scope's distribution of the ecological land was abstracted.The final result is quite consistent with the ecological regulation line which the government of Shenzhen have enacted.Finally, results of this thesis are synthesized, questions to be explored in the future are raised and expectation on this research fields is systematically presented.