期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：The aim of this paper is to develop methods for presenting geodata for personal navigation in real-time to a mobile user. Ideally, the user should have an overview map in the vicinity of his position; required for e.g. choosing the right road in a crossing. At the same time the user requires a small-scale map where he can see the final target of his route. A solution to obtain these user requirements is to create a variable-scale map that is constantly changing to make the user position always be in the large-scale part of the map. In the paper a formula for a variable-scale map is derived and its properties are demonstrated. Furthermore, real-time generalisation methods are described, these methods are used to adapt the original cartographic data to the small-scale areas of the map. A prototype system of a variable-scale approach was created using the emerging XML-based vector-data standards (GML and SVG), where the generalisation and scale-variations were performed in an XSLT transformation. The paper describes a minor case study which shows that variable-scale maps have a potential for personal navigation
关键词：Visualisation; Algorithm; Data structure; Multi-scale database
