3-D Terrain Visualization Database for Highway Information Management

摘要

The full digital, computer based Multimedia based Highway Information System211u001e(MMHIS) uses technologies of video, multimedia data synchronization, three-211u001edimensional visualization, high-speed networking, and video server. This paper 211u001epresents the development for the three-dimensional (3-D) terrain visualization 211u001euser-interface of MMHIS, based on the Application Programming Interface (API) of 211u001eOpenGL. Digital Elevation Models (DEM) from the US Geological Survey (USGS) were 211u001eused to construct the 3-D terrain surface of the entire state. A unique picking 211u001ealgorithm was devised to conduct visual queries on the terrain surface of the 211u001estate. The 3-D user-interface allows the user to zoom, rotate, and pan around the 211u001estatewide terrain surface for multimedia data query.