An Adaptive Visualized Model of the Global Terrain Based on QTM
Zhipeng Wang · Acta Geodaetica et Cartographica Sinica · 2007
Real-time and realistic visualization of the Earth terrain is one of the fundamental problems in Geography and Spatial Information Science.In this paper,an adaptive visualized model of the global terrain based on QTM(Quaternary Triangular Mesh) is approached.In order to store and index the global elevation data efficiently,a data structure of Diamonds quadtree and a dynamical operation method of the DEM data blocks are developed.Then,an adaptive simplification rule of hierarchical triangles in DEM data blocks is presented.In the end,the experiment and analysis are done with the global terrain dada,GTOPO30.The results illustrate that the methods are smoothly and receivable.