| As the requirement of people is increasing on display effect,traditional way can't satisfy people more and more.3D display technology is developing rapidly,such as holographic and 3D movie technology.But the existing technology has the limitation of the degrees of freedom and external devices.The research on the display of 3D sandbox is based on the entity sandbox,and the LED device is displayed on the side and top to achieve the purpose of showing topography.The research of this paper mainly includes the acquisition and preprocess of the multi-source data,design 3D sandbox display data's structure and image mapping algorithm,then construct virtual display system based on OpenGL.Among them,multi-data acquisition ways including resource satellite data and 3D reconstruction based on UAV take images.First,pretreat the DEM and color data from different source.The pretreatment includes formatting,data sampling,build virtual grid and color data fusion.Second,a data structure combined with linked list and matrix is designed to store and read display data quickly and accurately.Next,image mapping algorithm mainly solve the orthogonal projection image to the multidimensional space mapping,the result is associated with the distribution of DEM data,at the same time solve the DEM data and color data accuracy inconsistent problem.Finally,use OpenGL modeling and use the brush rendering.The virtual display system,enhance the user experience. |
