大数据"时代的到来,提供了新的研究方法与研究视角。人作为信息化的主体,随着移动信息通信技术的快速发展以及信息通信设备的日益普及,人们在网络中遗留的带有地理空间信息的大规模"痕迹"成为重要的研究数据,并开始被地理学者广泛关注。本文尝试通过借助新浪微博,引入位置服务签到大数据分析南京市区活动空间的总体特征通过与基于城镇人口的空间等级对比研究发现活动空间等级的依赖与极化并指出信息时代下距离的二重作用是导致空间极化的最主要原因。

Since the entrance to 21st century, the growing popularuty of mobile communication devices such as smart phones and PDAs, as well as the fast development of wireless communication technologies such as 3g wireless network and GPS, the mobile information network has become the new trend of informatization. On this new trend, residents are able to access Internet information anytime anywhere; and thus promote the penetration of ICTs into almost every aspect of people's daily life. With the development and applicaton of LAD, LBS and other related technologies, residents' activity and their real-time geospatial information has been recorded. These big "traces" with geospatial information should be emphasized for geographers' analyses which will undoubtedly provide support for the construction of "Smart city". With a soring popularity of online social network as Sina micro-blog (the most influential social networking platform in China) and the LBS checking-in application, this paper tries to visulize the characteristics of urban activity space in Nanjing, using these LBS checking-in data in Nanjing city from Sina micro-blog. The results indicate obvious hierarchical cluster and strip layout along transport corrider, with a somewhat tiny spatial difference between female's and male's. Compared with the urban hierarchy based on urban populaion, The urban activity space shows a consistency with the urban hierarchy based on urban population, but with a more apprent pramid structure in which the gap between differnent level is larger.