网络信息空间的城市地理学研究：综述与展望

20世纪90年代,互联网飞速发展,不仅深刻地影响了我们的社会系统和经济结构,同时也重构了全球城市的物理和虚拟空间结构形式。近几年,在西方发达国家,网络信息空间的相关研究已经成为多学科研究的热点,有关城市网络信息空间的地理学研究也不断涌现。从技术与经济的角度入手,在已有文献资料基础上,对西方地理学界关于网络信息空间与城市发展的研究进展进行了评述。首先界定网络信息空间的概念及其相对于物理空间的各种特征,然后总结城市学者研究网络信息空间的几种理论方法,并从三个空间层次分别评述现有的实证研究成果。在此基础上,对网络信息空间的测量方法和关于城市地理学的研究内容进行了进一步展望。     

Geovisualization of Human Hybrid Activity-Travel Patterns

While GIS‐based geovisualization techniques have been fruitfully employed in a wide range of fields, they have not been applied to explore human hybrid activity‐travel patterns (i.e. the patterns of people's activities and/or travel in both the physical and virtual worlds). This study develops two geovisualization approaches using 3D and 2D GIS techniques to address the difficulties faced by past studies. First, the notions of information cube and hybrid 3D space‐time paths are developed to accommodate cyberspatial activities in exploratory data analysis. Second, a new representation of 2D space‐time paths that incorporates parallel coordinate plots is developed for exploring the multiple attributes of people's Internet and physical activities. These two methods were implemented using ArcObjects and the Visual Basic for Applications environment in ArcGIS. They were used to visualize a complex Internet‐activity diary dataset collected in Columbus (Ohio, USA). The study shows that the 3D and 2D geovisualization methods developed allow us to uncover important patterns in hybrid human activity‐travel behavior.