POSITION SPACE IDENTICATION METHOD, POSITION SPACE IDENTIFIER IMPARTING DEVICE, AND COMPUTER PROGRAM

The present invention provides a method for imparting unique identifiers that do not overlap each other to individual position spaces in the case of latitude and longitude information or even in the case of height information also included in addition thereto. A longitude line passing through the coordinate origin is divided by the length of one side of a unit grid, and a latitude value inside unit grids is calculated. An accumulated error is calculated in a case where latitude values inside the unit grids are accumulated for one round in a longitude line direction of a celestial body, and an error per unit grid is calculated based on the calculated accumulated error. The number of unit grids included in one block in the longitude line direction is specified so that a reference error per block is equal to or smaller than one thousandth of the accumulated error, and thus a reference latitude is set. A reference longitude is set by the same calculation process for each latitude line that is determined based on the set reference latitude, reference points are specified sequentially from the coordinate origin based on the set reference latitude and reference longitude, and a unique identifier is imparted to each unit grid located in a block with the reference points set as its vertices.