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《Science of Surveying and Mapping》 2009-02
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Research on a mix global grid data structure and encoding

HAN Yang,WAN Gang,CAO Xue-feng(Institute of Surveying and Mapping,Information Engineering University,Zhengzhou 450052,China)  
Based on the advantage and disadvantage of equal space global grid data structure and spherical discrete grid system and characteristic of map projection, we bring formard a mix global data structure. The data structure divides the global into six faces that are all 90°on a side. Four equatorial faces comprise 360°of longitude and 90°of latitude 45°S to 45°N, which are covered with rectangles. Two polar faces utilize a squared projection of round polar caps in which circular latitude parallels map to concentric equidistaqnt squares, which are covered with triangles. The mode of grid coding and data storage is expatiated and the method that converts the grid code to geographical coordinate is proposed.
【Fund】: 装备预先研究项目地理空间信息网格技术(406010102)
【CateGory Index】: P282.1
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