<div style="text-align:justify;"> In the era of information and communication technology (ICT) and big data, the map gradually shows a new qualitative feature of “spatiotemporal ubiquitous” due to th...<div style="text-align:justify;"> In the era of information and communication technology (ICT) and big data, the map gradually shows a new qualitative feature of “spatiotemporal ubiquitous” due to the extension of its object space and the geographic information it contains, which brings new challenges to map information organization. This paper analyzes the concept and information characteristics of the ubiquitous map. Based on that, it proposes a ubiquitous map information organization model oriented to location-based aggregation. This new model includes three parts as “ubiquitous map instance”, “location-based aggregation mode” and “map scene”. This paper focuses on the “map scene” part which is the core of the model and contains two mutually mapped aspects as “content scene” and “representation scene”. And both aspects are divided into three levels as “features” ←→ “elements” ←→ “scenes” according to ubiquitous map information characteristics and location-based aggregation mode. With cases of map decomposition, the application of the model is explained to illustrate its effectiveness. The model is expected to provide powerful data organization and management capabilities for ubiquitous map production and use. </div>展开更多
定位导航授时(positioning navigation and timing,PNT)是国家重要战略基础设施,目前中国已经建立了完善的北斗天基增强系统、地基增强系统、低轨增强系统,室内外定位技术蓬勃发展,但声光电磁等多种定位技术手段在全球导航卫星系统(glob...定位导航授时(positioning navigation and timing,PNT)是国家重要战略基础设施,目前中国已经建立了完善的北斗天基增强系统、地基增强系统、低轨增强系统,室内外定位技术蓬勃发展,但声光电磁等多种定位技术手段在全球导航卫星系统(global navigation satellite system,GNSS)拒止环境受到诸多限制,在深空、深地、深海三深空间综合PNT依然面临许多困难。近年来,数字孪生、实景三维等战略逐渐落地,三维场景为提高综合PNT的完好性、连续性、可用性提供了新的机遇。对综合PNT场景增强国内外技术现状进行了系统梳理,总结了综合PNT场景增强系统面临的挑战,阐述了综合PNT场景增强系统建设主体、服务层次、系统架构等基本框架,展望未来中国的综合PNT体系是以北斗PNT为核心,天基增强、地基增强、低轨增强、场景增强多源信息集成的服务于全空间的综合PNT智能服务体系。展开更多
文摘<div style="text-align:justify;"> In the era of information and communication technology (ICT) and big data, the map gradually shows a new qualitative feature of “spatiotemporal ubiquitous” due to the extension of its object space and the geographic information it contains, which brings new challenges to map information organization. This paper analyzes the concept and information characteristics of the ubiquitous map. Based on that, it proposes a ubiquitous map information organization model oriented to location-based aggregation. This new model includes three parts as “ubiquitous map instance”, “location-based aggregation mode” and “map scene”. This paper focuses on the “map scene” part which is the core of the model and contains two mutually mapped aspects as “content scene” and “representation scene”. And both aspects are divided into three levels as “features” ←→ “elements” ←→ “scenes” according to ubiquitous map information characteristics and location-based aggregation mode. With cases of map decomposition, the application of the model is explained to illustrate its effectiveness. The model is expected to provide powerful data organization and management capabilities for ubiquitous map production and use. </div>
