Traditional GIS caused obstacles and inconveniences for sharing and services of global spatial information. In this paper, spatial information multi-grid (SIMG) is presented to institute a uniformed, rigorous, and continuous national spatial information infrastructure for national service. Firstly, its fundamental theories and key technologies are brief introduced. Then, this paper discusses its theoretical framework, notional model, data structure and relative methods designed for service. At last, a prototype system is cited to verify its feasibility and validity.
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