Research On Web-Based Terrain 3D Modeling And Its Application

In the paper, the background and present situation of study of web based 3D modeling have been introduced, and the way of terrain modeling which is suitable for web transmission and its key technology have been analyzed. A method ofImuti-resolution compression and stream transmission of terrain model has been studied. The method is used for the first time to realize the stream progressing transmission mechanism of web based terrain 3D basic data. The way of organizing and managing terrain 3D data in web transmission, the establishment of index mechanism and the realization of index process have been studied. The method of constructing and progressively transmitting 3D terrain texture data based on multi-resolution progressive layers is put forward for the first time. Three-level buffer and asynchronous transmission mechanism are designed by ourselves independently, thus the I/O and web transmission of data can be reduced greatly. Many functions are realized, such as vector data querying, spatial coordinates querying, spatial distance measuring and calculating, section drawing, slope/direction of slope calculating, etc.