基于长时序夜间灯光数据的南京市城区范围时空分异研究

Analysis of the construction strategy of mobile library service system modelin the situational awareness perspective

随着城市化水平的不断提高,城市时空格局演变已成为城市可持续发展的重要研究方面,能够为国土空间规划提供直接的辅助作用。文章以南京市三大主要城区(主城区、高淳区、溧水区)为研究对象,基于2000—2019年长时序夜间灯光影像提取城区范围,综合城市紧凑度、分形维数、重心坐标转移模型和扇形分析法等指标方法研究南京市城区时空演变过程以及城区扩张空间差异。结果表明:夜间灯光能够较好地表征城区空间演变趋势;主城区扩张主要方向为南部、东偏北、北部,溧水区为北部、北偏东,高淳区为东偏北。

In the design of mobile library service systems,situational factors can be used to improve perception ability,thereby achieving personalized and intelligent service functions.Situational factors can be divided into various types such as users,society,and environment.The service system model based on situational awareness consists of a situational factor perception layer,a situational factor aggregation layer,a situational data storage layer,and a situational application service layer.The core of system design is situational aware reasoning and computation,which relies on algorithmic programs.During the research process of the article,combining personalized book recommendation services,the fusion method of situational awareness and matrix decomposition recommendation algorithm was introduced,achieving good recommendation results,indicating that situational awareness can effectively improve the service level of the system.