A Study on Site Coverage Spatial Distribution Pattern of Beijing City Based on Gis

The development of a city was to a large extent reflected in its construction distribution.Study of characteristics of the city construction distribution provided guidance for urban planning and land intensive use.In this paper,with the help of MapinfoV7.0 and Arcview3.3,grids of 2.0km were made as statistical units to calculate the building density of Beijing beyond the build-up areas to keep spatial continuity.Contours of building density were created to analyze its spatial distribution pattern.We obtained 8 sections of different directions which taken the flagpole of Tian'anmen Square as center and ten sections between satellite towns and we also overlaid the building density contours with main roads in order to more accurately analyze the spatial change characters of building density.The results indicated that spatial grade distribution map of building density can visually reflected the construction of Beijing which had been transformed from "one center" to "multiple nuclei" and the developing regions mainly located in the plain areas as the building density of west and north mountainous regions were much lower.