开封市开放空间系统的设计与营建

开封市是我国"七大古都"之一,是"中原城市群"的重要成员,在河南省城市体系中发挥着"豫东区域性中心城市"的重要作用。将开放空间系统作为城市生态调控的"容器",通过开放空间系统的设计和营建来加强生态城市建设,是推动该市进入可持续发展状态的重要途径。文章在分析开封城市特色的基础上,论述了该市开放空间系统设计与营建的必要性及其应遵循的原则,提出开放空间系统圈层一体化的设计方案,以及绿色开放空间和灰色开放空间营建的要点。     

嵌入式数字城市空间管治地理信息系统

探讨了数字城市空间管治Mobile GIS的技术路线。通过城市空间管治动态信息采集、空间决策支持需求分析，设计实现了基于MapX Mobile的数字城市空间管治移动GIS系统。     

城市环境保护信息系统结构框架研究

随着城市化进程的加快,城市人口增加,城市环境保护成为城市关注的焦点.充分利用计算机技术、地理信息系统技术有利于提高城市环境保护规划及管理水平.结合城市环境保护局的工作内容及实质,提出了基于办公自动化、管理信息系统、网站发布系统、GIS可视化信息系统的城市环境保护信息系统的结构框架,并对系统框架的构成、信息流程、服务和应用模式进行了论述,探讨了基于WEB GIS的信息系统应用的系统数据体系以及基础地理信息系统、图文一体化、空间分析、决策支持等系统功能.     

城市职能体系研究的思路与方法--以太原市为例

全面认识城市职能体系需从其结构属性和空间属性两方面着手，从职能层次、职能规模和职能强度三方面来界定，思路是将城市职能的结构属性与空间属性结合起来，研究城市在不同空间尺度的主要职能。文章以太原市为案例，构造了区位熵、职能规模、职能强度3个指标，对太原市在省域、中西部、全国3个空间层次的城市主要职能进行了分析、力图通过该市的案例，探讨单个城市职能体系实证研究的思路和方法，从多角度较为系统地认识一个城市的职能体系，为城市定位和城市性质确定提供更丰富的基础依据。     

Cross‐border Urban Governance in Hong Kong: The Role of State in a Globalizing City‐Region*

The rapid development in the Hong Kong‐Pearl River Delta (PRD) city‐region has taken place alongside complicated cross‐border governance. The framework of time‐space envelopes (TSEs) is adopted for a study of cross‐border governance in Hong Kong, especially in the role of the state, that is, the Hong Kong government, in cross‐border urban governance. This article argues that tension‐ free regional integration has never existed due to a complex governance network. The shift from “cross‐border protectionism” to “cross‐border free trade zone” in Hong Kong's cross‐border urban governance since 2001 is a result of the rearticulation of the state cutting through the geoeconomic and geopolitical TSEs.     

Study on the characteristics of earthquake''''s impact on cities

Introduction With rapid development of national economy, urbanization has been speeded up in China, and several city groups or city belts with extra-large cities as their centers have been formed. For example, Pearl River Delta urbanized area surrounds Guangzhou City, Shenzhen City, Zhuhai City; Yangtze River Delta urbanized area surrounds Shanghai City, Suzhou City, Wuxi City, Nanjing City, Hangzhou City; Beijing-Tianjin-Tangshan urbanized area surrounds Beijing City, Tianjin City…     

3D Building Modelling with Digital Map, Lidar Data and Video Image Sequences

Three-dimensional (3D) reconstruction and texture mapping of buildings or other man-made objects are key aspects for 3D city landscapes. An effective coarse-to-fine approach for 3D building model generation and texture mapping based on digital photogrammetric techniques is proposed. Three video image sequences, two oblique views of building walls and one vertical view of building roofs, acquired by a digital video camera mounted on a helicopter, are used as input images. Lidar data and a coarse two-dimensional (2D) digital vector map used for car navigation are also used as information sources. Automatic aerial triangulation (AAT) suitable for a high overlap image sequence is used to give initial values of camera parameters of each image. To obtain accurate image lines, the correspondence between outlines of the building and their line features in the image sequences is determined with a coarse-to-fine strategy. A hybrid point/line bundle adjustment is used to ensure the stability and accuracy of reconstruction. Reconstructed buildings with fine textures superimposed on a digital elevation model (DEM) and ortho-image are realistically visualised. Experimental results show that the proposed approach of 3D city model generation has a promising future in many applications.     

数字城市基础空间数据建库中的质量检查与控制分析

基础空间数据库是数字城市的核心,而数据质量的高低又是数据库建设成功与否的关键。本文在简要分析数字城市基础空间数据库构建过程的前提下,详细论述了数字城市基础空间数据建库中需进行的质量控制内容及方法。     

基于遥感的区域景观特征及其动态变化研究——以重庆市北部新区为例

在RS和GIS技术的支持下，以1997年、2000年和2002年TM图像为数据源，利用平均斑块面积、分维数、块斑伸长指数、景观多样 性指数、蔓延度和破碎度指数等景观特征指标，从多个层面对重庆市北部新区区域景观特征及其动态变化进行了研究。结果表明，在5 a时间内，区域景观特征发生了很大变化，已经从城乡过渡带景观演变为快速城市化的城市景观。主要表现为各类城市建设用地不断扩 大，呈现出空间集中化的特点，耕地和绿地在区域发展过程当中扮演着用地来源的角色，逐步被蚕食、分割，区域生态环境遭到破坏。     

Deblurring Texture Extraction from Digital Aerial Image by Reforming “Steep Edge” Curve

Texture extract from digital aerial image is widely used in three-dimensional city modeling to generate “photo-realistic” views. In this paper, a method based on reforming “Steep edge” curve, which clearly explains how the diffraction of the sunlight makes digital aerial image blurring, is proposed to deblur the texture extraction from digital aerial image, and the experiment shows a good result in visualization and automation.