Study On Analysis And Comparison Of Daily Communication Area Of Beijing,Shanghai And Guangzhou

Daily communication area(DCA) is a simple and visual method to describe the relationship of cities.It is a meaningful thing to improve coverage area and population of important cities's DCA.It can help more people enjoy the convenient service of city.So research on(DCA) has a big value to promot social equity,make universal access to economic development results and build a harmonious societyThe dissertation is described from two sides—subject on the center city and object on the hinterland cities to study the construction and effect of DCA.The typical cities in the Pearl River Delta,the Beijing,Tianjin and Hebei metropolis circle and Yangtze River Delta are chosen to be case studies.This paper analyzed DCA's form factor,distribution feature and the influence factor with GIS technologies.Their spatial-temporal development discipline and inner construction feature were discribed. Dynamitic changes of hierarchy of hinterland cities in DCA and the relationship with economic development are to be studied.This paper also talked about function and position of DCA in region research.In general,the DCA of Beijin,Shanghai and Guangzhou are relatively closure in 1990 and closely linked with region in 2005.In the future,the DCA of three cities would be broken the boundary of the Beijing,Tianjin and Hebei,Yangtze River delta and Pearl River Delta.A new type for the DCA which is across the region would come into being.The contributions to DCA from roads are up to five aspects,such as the level of road network,density,layout,alternative and natural barriers.In the mass,high-level highway is better than low-lever for the contribution.In terms of expanding of DCA,the potential of shanghai exceeds Beijing and Guangzhou,but its absolute number is inferior to their.Besides depending on the high-speed railway,Beijing and Guangzhou should construct more low-level road networks in order to bring high-level road network's strong radiating capacity.Then Shanghai should open north-south direction passage and improve the actual running speed simultaneously in order to expand the DCA rapidly.In terms of two indexes on per-capita GDP and development speed from cities in different hinterland,shanghai is highestand the most balanced.Beijing is generally the most backward and the most uneven.