Urban expansion is a phenomenon of urban space increase,and an important measuring index of the process of urbanization.Taking Shanghai as an example,the changes of urban average height and built-up area were studied ...Urban expansion is a phenomenon of urban space increase,and an important measuring index of the process of urbanization.Taking Shanghai as an example,the changes of urban average height and built-up area were studied to represent city's vertical and horizontal increases respectively,and statistical methods were used to analyze the driving forces of urban expansion.The research drew following conclusions:1) The urban expansion process of Shanghai from 1985 to 2006 had a clear periodic feature,and could be divided into three stages:vertical expansion in dominance,coordinated vertical and horizontal expansion,and horizontal expansion in dominance.2) The average height and quantity of buildings in core city were significantly bigger than those in suburbs,but the changing speed of the latter was faster.And 3) urbanization process was the major driving force for the city's horizontal expansion,while industrial structure improvement was the key driving factor for the vertical expansion.Those two driving forces were simultaneously affected by city's political factors.展开更多
由于城市空间规划数据获取难度大,且需要考虑环境、交通、社会等多方面因素的影响,规划难度较高。因此,本文设计基于地理空间信息系统的城市空间规划模型。该模型以支撑层作为模型运行支撑,门户层通过身份认证后,下达城市规划指令,数据...由于城市空间规划数据获取难度大,且需要考虑环境、交通、社会等多方面因素的影响,规划难度较高。因此,本文设计基于地理空间信息系统的城市空间规划模型。该模型以支撑层作为模型运行支撑,门户层通过身份认证后,下达城市规划指令,数据层通过奇异值分解方法融合城市空间数据,构建空间数据库,存储各类城市空间数据;应用层调用数据库中的各类城市空间数据,基于空间启发式布局优化方法,实现城市土地布局规划,采用VR-GIS可视化技术,构建城市空间的三维实景。测试结果表明:该模型的三维实景渲染效果良好,城市整体规划的连通性达到0.55以上,PC(probability of connectivity)指标的取值最高值为0.83,可依据用地类别需求完成土地布局规划。展开更多
基金Under the auspices of the Key Direction in Knowledge Innovation Programs of Chinese Academy of Sciences (No KZCX2-YW-422)National Natural Science Foundation of China (No 40701059)
文摘Urban expansion is a phenomenon of urban space increase,and an important measuring index of the process of urbanization.Taking Shanghai as an example,the changes of urban average height and built-up area were studied to represent city's vertical and horizontal increases respectively,and statistical methods were used to analyze the driving forces of urban expansion.The research drew following conclusions:1) The urban expansion process of Shanghai from 1985 to 2006 had a clear periodic feature,and could be divided into three stages:vertical expansion in dominance,coordinated vertical and horizontal expansion,and horizontal expansion in dominance.2) The average height and quantity of buildings in core city were significantly bigger than those in suburbs,but the changing speed of the latter was faster.And 3) urbanization process was the major driving force for the city's horizontal expansion,while industrial structure improvement was the key driving factor for the vertical expansion.Those two driving forces were simultaneously affected by city's political factors.
文摘由于城市空间规划数据获取难度大,且需要考虑环境、交通、社会等多方面因素的影响,规划难度较高。因此,本文设计基于地理空间信息系统的城市空间规划模型。该模型以支撑层作为模型运行支撑,门户层通过身份认证后,下达城市规划指令,数据层通过奇异值分解方法融合城市空间数据,构建空间数据库,存储各类城市空间数据;应用层调用数据库中的各类城市空间数据,基于空间启发式布局优化方法,实现城市土地布局规划,采用VR-GIS可视化技术,构建城市空间的三维实景。测试结果表明:该模型的三维实景渲染效果良好,城市整体规划的连通性达到0.55以上,PC(probability of connectivity)指标的取值最高值为0.83,可依据用地类别需求完成土地布局规划。
