Abstract: The geospatial grid divides the geospatial region into spatial reference systems with different scale grid units. Grid coding uses the structured index technology of location to assign identifier to each grid of geospatial grid system, so as to realize the unified identification of grid location. This paper contrasts the identification requirements of the multi-level and multi-resolution global mesh grid system formed by nesting and sectioning according to the uniform rules,based on the analysis of the current geospatial index identification technology, discusses the coding scheme of the global mesh grid system, and proposes a set of geospatial grid identification system which realize the unique identification of the global grid units, describes the spatial position of grid cells,and reflects the spatial relationship between grid cells.

Key words: geospatial grid, spatial reference frame, grid unit, mesh, grid coding