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In order to effectively solve the problems of global discrete grid in spatial data management and operations, a
novel equal area quad-tree global discrete grid subdivision model based on latitude and longitude lines is proposed in this
paper. Coding rules of grid cells, and geometric distortion calculation and analysis of the grid model are also given in the
detailed subdivision process. The results have shown that the proposed grid cell has simple structure and stable geometric
distortion. Meanwhile, it features hierarchy and nested structure and thus facilitates multi-resolution modelling.