3D GIS will be the next generation of geographic information system (GIS). Ideally, 3D GIS should be developed based on good theoretical foundation. Currently, many researches have been carried out both by academic groups and commercial sector to develop 3D GIS application. So far, there is no ideal 3D GIS product available on market partly due to the complicated topology of spatial objects in 3D environment, inappropriate spatial data structures and hardware limitation. Studies carried out indicated that the integration of 3D visualization technology with current 2D GIS applications could be an alternative for realizing 3D GIS. One obvious benefit of such combination is that it can take advantages of both technologies. Service-based integration aims to realize the integration of 2D GIS with 3D virtualization technology based on service framework. Data transmission speed between remote server and client is the main bottleneck of providing textures for 3D rendering engine. Thus, the key problem of this type of integration is how to maintain the frame rate of rendering in 3D client under the limited data transmission speed. This paper promotes a system architecture based on C/S framework, in which the core is consisted of a LOD-based rendering architecture and a data service architecture based on double cache mechanism, which will help overcome above problems. The double cache mechanism is designed to improve the performance of data serving at both client side and sever side by using a client data cache and a sever data cache. The prototype GIS sever is developed by ArcGIS Engine to provide data and traditional 2D GIS service, for example, spatial querying, for 3D client. The client application is developed with help of World Wind, an open source software, which acts as a user interface. The results obtained by this prototype system show that how this framework helps to overcome the key problem of the integration of 2D service GIS with 3D visualization technology, which would be extended for various applications in feature. This framework is also suitable for B/S framework simply by encapsulating 3D client into a web component.
YU Linjun, PAN Ying
. The Key Problem of Service-based Integration of 2D GIS and 3D Visuliation Technology and Its Solution[J]. Journal of Geo-information Science, 2011
, 13(1)
: 58
-64
.
DOI: 10.3724/SP.J.1047.2011.00058
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