Global Terrain Data Model Based on Continuous Spherical Grid

An efficient technology was proposed to build the global terrain data model.The proposed method introduced a novel strategy to code and index the global data,which extended the idea of QTM.Instead of the triangle,the block,composed of a few hundreds of triangles,was used as the basic primitive entity in the entire model.And the global data was cache-coherent stored block by block,which was efficient for the users to manage and dispatch.The proposed technique is fully scalable to support the applications of global data analysis or visualization,etc.