Download 3D Geo-Information Sciences by Hui Lin, Jun Zhu, Bingli Xu, Wenshi Lin, Ya Hu (auth.), PDF

By Hui Lin, Jun Zhu, Bingli Xu, Wenshi Lin, Ya Hu (auth.), Jiyeong Lee, Sisi Zlatanova (eds.)

In fresh years 3D geo-information has turn into an enormous learn quarter end result of the elevated complexity of projects in lots of geo-scientific purposes, corresponding to sustainable city making plans and improvement, civil engineering, probability and catastrophe administration and environmental tracking. furthermore, a paradigm of cross-application merging and integrating of 3D info is saw. the issues and demanding situations dealing with today’s 3D software program, as a rule application-oriented, concentration virtually completely on 3D facts transportability matters – the facility to take advantage of facts initially built in a single modelling/visualisation process in different and vice versa. instruments for elaborated 3D research, simulation and prediction are both lacking or, whilst on hand, devoted to particular initiatives. in an effort to reply to this elevated call for, a brand new kind of approach should be constructed. a completely constructed 3D geo-information process might be capable of deal with 3D geometry and topology, to combine 3D geometry and thematic info, to research either spatial and topological relationships, and to provide the information in an appropriate shape. as well as the straightforward geometry kinds like aspect line and polygon, a wide number of parametric representations, freeform curves and surfaces or sweep shapes need to be supported. methods for seamless conversion among 3D raster and 3D vector representations may be on hand, they need to permit research of a illustration most fitted for a particular application.

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2006. The Virtual 3D City Model of Berlin - Managing, Integrating, and Communicating Com- 2. Representing and Exchanging 3D City Models 31 plex Urban Information. In: Proceedings of the 25th Urban Data Management Symposium UDMS 2006 in Aalborg, DK, May 15-17. 2006. 31. org 32. Kolbe, T. , 2008. CityGML – 3D City Models and their Potential for Emergency Response. ), Geospatial Information Technology for Emergency Response, Taylor & Francis 33. , 2006. Conception of a 3D Geodata Web Service for the Support of Indoor Navigation with GNSS.

CSG and sweep geometries have to be converted to BRep though. This way, IFC objects can be brought into the context of a city model within a GIS or spatial database and could then become subject to spatial and thematic queries (see [25]). The derivation of IFC objects from CityGML data is a topic of future research, because from CityGML’s surface models 3D volumetric components would have to be reconstructed. However, CityGML may be a good intermediate step in the (semi)automatic acquisition of IFC models, because the CityGML object classes like WallSurface, RoofSurface etc.

Also the solids of adjacent objects like BuildingParts must touch but their interiors are not allowed to permeate each other, because space can only be occupied by one physical object. In the application field of indoor navigation, rooms should be topologically connected as this facilitates the computation of a connectivity graph which then can be transformed to a 3D geometry network for route planning [15, 16]. In the past, different frameworks for the representation of 3D topology have been presented [17, 18, 19].

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