Study On Urban Landscape Pattern And Its Thermal Environment Effect Based On Remote Sensing Image

At present, world urbanization accelerates greatly, especially in developing countries, which has already become one of the major manners for human to change the Earth and the land use/cover. From the viewpoint of landscape, urbanization was followed with series of physical ecology landscapes replaced by human ones, which implies an important physical and social ecology process. This thesis, selecting Shanghai city as an example area, firstly discloses the evolving characters of spatio-temporal pattern of all kinds of urban landscapes with quantificational information obtained by remote sensing methods. Based on the relationship analysis between landscape pattern and thermal environment effect, the paper studies synthetically the mechanism of urban thermal environment developing, which can provide basic ideas for reducing farthest all the destruction to natural environment and seeking balanced development between human and Earth of urban, Studying the landscape spatio-temporal pattern and its thermal environment effect at urban scale by GIS&RS methods firstly provides a new paradigm for the study of urban landscape ecology or urban ecology environment in theory, at the same time can perfect or promote the methods and system info of landscape ecology, can also support the decisions for urban planning, urban constructing, environment protecting and regional sustainable development in Shanghai city.Chapter 1 is "Introduction", puts forward the study value. According to the relative study background at home and abroad, the landscape ecology is the most active subject in Ecology field. Urban landscape is paid more attention in landscape ecology studying. But the pattern-process paradigm of urban landscape has been restricted for strong factitious character of landscapes. Ecology environment is more and more important in urban area, studies on which are of great value. Therefore selecting the latent energy flow (thermal environment) behind urban landscapes as ecology process of landscape pattern, which link the urban landscape ecology with urban environment problems and introduce the study paradigm of landscape ecology into urban ecology environment successfully, has important signification in theory and practice.In chapter 2, based on the analysis of referenced theories and methods, the paper emphasizes two improved or innovated methods: linear spectral unmixing for mixing pixels and multivariable synthesis analysis model based on map algebra. Through changing endmember select methods, the precision of linear spectral unmixing in urban ecology environment is a lot improved. Through using map algebra, converting data format, scaling and combining GIS, RS with multivariable analysis, the paper provides a new multivariable synthesis analysis model based on grid, which provides a general technology frame for urban ecology environment study. The chapter also introduces the research area and content simply, at last gives the research flow map.In chapter 3, through scaling (upscaling and downscaling), all kinds of landscape take on distinct variation pattern to the scale changing. Though the study we can know that 40-meter grain compared with other grains in Shanghai city is more close to intrinsic scale of urban landscape. Aimed to the given study object, outline highway is chosen as a whole. According to analyzing the response characters of spatial heterogeneity of landscapeindices to extent changing, 1km extent is a perfect choice.In chapter 4, the spatial distribution of impervious surface in Shanghai city was obtained by improved linear spectral unmixing method based on vegetation-impervious surface-soil model principle. The values scattered in the districts in urban center are higher than the ones in Pudong new area, but the discrepancy among them is not distinct. The spatial distribution rule for impervious at the scale of street or town is more distinct. High values are mainly distributed in the interior of inner ring road on the west of Huangpu River. From the inner of downtown center to the outer, the values decrease gra...