Representation And Visualization Of Dynamic Objects For 3D GIS

The development of 3D GIS presents us a rich and colorful world. Currently, there are many mature applications in static objects visualization, such as terrain, buildings, vegetation, but there are not many researches into dynamic objects visualization. Presently, people have done some research on dynamic objects visualization using techniques such as simulation and visualization in scientific computing, but there are not many researches on integrating dynamic objects such as running cars, aflutter flags, flying butterflies into 3D GIS.In this paper, aiming at the application requirement of 3D GIS, the necessity and the feasibility of research on 3D dynamic objects is put forward, some work is done in the application of dynamic objects in 3D GIS. Firstly, the paper analyses the conception, the character, and classification of dynamic objects, and then proposes an object-oriented spatial data model and the method of designing the data structure for dynamic objects. Next, the paper summarizes the visualization method of dynamic objects. Furthermore, this paper discusses the movement character and visualization method of rigid body and particle system. Aiming at the simplification and dispatching of a great deal of dynamic objects, the paper introduces the LOD method of rigid body and particle system in a few aspects, such as visibility judging, model simplification, level of motion, collision detection. Finally, the module of dynamic object visualization of CCGIS software is illustrated.