To simply specify a location by relatively reducing the number of substantial digits by distributing young numbers in a code system of a specific code.
A map data base is constructed so that the whole country map making a first mesh consisting of a measure of (longitude × latitude = 900sec.×900sec.) a unit, and further, an area in each measure of the first mesh making a second mesh consisting of the measure of (30sec.×30sec.) a unit, and the area in each measure of the second mesh making s third mesh consisting of the measure of (1sec.×1sec.) are specified. In such a case, by expressing respective areas with 9 digits connecting three codes of a division code, a block code and a unit code, a code number corresponding to one-to-one is formed for every unit. Then, the location is specified with the area of the (longitude × latitude = 1sec.×1sec.) by the specific code defined for the unit capable of covering the whole country map.
FURUIKE YOSHIYUKI
MITSUI TAKAO
