Tessellation and Distortion Analysis Based on Spherical DQG
Xuesheng Zhao · Geography and Geo-Information Science · 2007
To overcome the deficiency in managing and operating the global data of both Longitude-Latitude Grid and Quaternary Triangular Mesh(QTM),a new discrete global grid——Degenerate Quadtree Grid(DQG) is put forward,and its tessellating principle and coding rule are presented.Then,its geometrical distortion is calculated and analyzed in details.The experiment results show that the DQG has not only simple geometrical structure,but stable geometrical distortion as well.