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《Acta Geodaetica Et Cartographic Sinica》 2003-03
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Fast Translating Algorithm between QTM Code and Longitude/Latitude Coordination

ZHAO Xuesheng1,2, CHEN Jun2 (1.China University of Mining and Technology,Beijing 100083,China; 2. National Geomatics Center of China, Beijing 100044, China)  
QTM (Quarternary Triangular Mesh) structure on spherical surface is an efficient method in managing the global large quantities of the earth data. But the existed translating methods between QTM Code and Longitude/Latitude Coordination have low efficiency in translating speed or lack of certain orientation in encoding. To overcome this serious deficiency, a new translation method——CAM (Cavalcade Approach Method) is presented. The principle of this method is based on the Row and Column of QTM and recursively approach the address codes according to certain orientation. Detailed steps of new algorithm are also presented. Different translating methods are analyzed in experiment by using different number of points in different levels. The result indicates that in CAM method not only the address code is generated in certain orientation but also time consumption is only about 7%~20% of ETP (EqualTriangles Projection) method.
【Fund】: 国家杰出青年基金资助项目(40025101)
【CateGory Index】: P208
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