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：2009
卷号：XXXVIII-3-4/C3
页码：9-15
出版社：Copernicus Publications
摘要：Mobile navigation is usually focused on car navigation which implies a limitation on a street network. Due to this, route instructions in most systems are based on distances and directions given by the underlying line graph. This type of navigation is not an optimal solution for pedestrians, as they are not necessarily bound to streets, walkways or other polylines to walk on. This paper suggests a concept that subdivides urban space into 'walkable', 'semi-walkable' and 'non-walkable' space that can be used by pedestrians to a certain extent. Advantages as well as shortcomings of this concept will be outlined and discussed. Due to the 'walkable space' concept the procedures of way-finding and route instructions need to be adapted because of the absence of an underlying line graph. In the presented approach instructions are going to be based on landmarks along the route that can be used by pedestrians for way-finding. The use of landmarks leads to a further concept that will be outlined in this paper: procedural fac.ade texturing for 3D urban models. As pedestrians navigate using landmarks, respectively the appearance of the fac.ades as the most prominent parts, .exible and adjustable building textures are needed to support intuitive navigation and orientation. Whereas this is a task-driven scenario models do not need to be photo-realistic and fac.ades can be used to provide a mixture of realism and abstraction (e.g navigation hints or thematic information) along the route. A basic concept for procedural texturing will be presented and a brief discussion on technical capabilities on mobile devices will be provided
关键词：pedestrian navigation; 3D city models; facade textures; urban space
