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-2/W11
出版社：Copernicus Publications
摘要：3D city models offered by digital map providers typically consist of several thousands or even millions of individual buildings. Those buildings are usually generated in an automated fashion by remote sensing methods and can by very detailed. However, not in each application such a high degree of detail is desirable. Whereas in some applications the requirements for storage consumption and processing power exceed the available resources, for visualization purposes it is not optimal to have too detailed graphics as well. Hence, it is necessary to generalize those city models in order to reduce their detail and to remove undesirable visual features. A simple way to remove complexity is to aggregate individual buildings whilst obeying a set of well-introduced rules. Some visualizations and simulations utilizing city models may greatly benefit from the simultaneous usage with terrain models. By simply displacing the z-coordinate of their nodes the buildings of the city models can by used in conjunction with these terrain models. However, when using terrain models, the use of conventional aggregation techniques for buildings is problematic and may result in faulty visualizations and simulations. This paper introduces the issue of aggregating buildings of city models, when they are used in conjunction with terrain models, presents a solution by considering height dependent constraints and discusses future optimizations of terrain-dependent aggregation of 3D city models
关键词：City models; terrain models; generalization; aggregation; geodata integration; geodata fusion; 3D visualization; 3D Generalization
