A 3-D Terrain Visualization Database for Highway Information Management
University of Arkansas, Mack-Blackwell National Rural Transportation Study Center, 1999 - Highway communications - 54 pages
The full digital, computer based Multimedia based Highway Information System (MMHIS) uses technologies of video, multimedia data synchronization, three-dimensional visualization, high-speed networking, and video server. This paper presents the development for the three-dimensional (3-D) terrain visualization user-interface of MMHIS, based on the Application Programming Interface (API) of OpenGL. Digital Elevation Models (DEM) from the U.S. Geological Survey (USGS) were used to construct the 3-D terrain surface of the entire state. A unique picking algorithm was devised to conduct visual queries on the terrain surface of the state. The 3-D user-interface allows the user to zoom, rotate, and pan around the statewide terrain surface for multimedia data query.
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Data Sources and Data Preparation for the 3D Visualization
User Selectable Tuming Movements
2 other sections not shown
3-D map 3-D objects 3-D rendering 3-D terrain surface 3-D TERRAIN VISUALIZATION 3-D user interface 4190 Bell Engineering allows the user Application Programming Interface based Highway Information Bell Engineering Center color computer network data sources data synchronization Database for Highway David Xy deﬁned Digital Elevation Models digital video display lists eyeX eyeZ Fayetteville ﬁrst grid points highway agency HIGHWAY INFORMATION MANAGEMENT Highway Information System Information System MMHIS initial viewpoint Kelvin C.P. Wang longitude and latitude Mack-Blackwell Transportation Center Microsoft model transformation modelview transformations Multimedia based Highway number and milepost OpenGL pavement photo logging system photogrammetry picking buffers Picking Operation pixels proﬁles projector raster map rotate route number shown in Figure slider statewide terrain surface stereo photogrammetry sub-sampling synchronization of video TERRAIN VISUALIZATION DATABASE texture mapping University of Arkansas USGS vector view transformation viewing angles Viewpoint Position visualization hardware Wang and David Windows bitmap format workstations world coordinate system Z-axis zoom