Visualization Of Large-Scale Terrain Based On OpenSceneGraph

3D terrain has extensive application in many fields, such as city planning, engineering design, environment supervision, disaster forecast, military affairs, games and entertainment. At present, how to realize the visualization of large scale 3D terrain based on great data is the hot topic of research, the following studies have been done around the problem.1) Interpolation and simplifying methods of Regular Square Grids. Focus on the simplifying method based on Quadtree. Summing up the process of OSG simplify .2) The pyramid data models are achieved with the data process of data division and simplization on DEM and texture data. They can provid the data model for the rendering of massive multi-resolution terrain visualization. Come to the conclusion of OSG data division and simplization.3) Study on mass data scheduling mechanism, the law of cracks, texture mapping technology. OSG approaches drawn to eliminate the gap.The traditional rendering of massive data has the features of high demand for hardware and software, long development cycle, high difficulty development and so on, and this thesis gives an effective solution for the traditional rendering of massive data, which is based on the OSG.As the OSG itself does not support Windows graphical interface, all the operations are only in MS-DOS mode to complete, which involves operations such as environment variable settings. Process cumbersome and not intuitive. Thesis based on MFC and C + + to prepare a friendly user interface, to facilitate the generation of LOD model and three-dimensional terrain model of view. For the rendering of massive data, the demand for hardware and software and the difficulty of development have been improved remarkably by taking the advantage of OSG. This paper introduces a strategy for integrating 2D data and DEM. This method sews like a sewing-machine the 2D data into DEM and use MySQL to manage 2D data .