| 摘要 |
A map is divided into sections of a square of 900''x900'', each of which is further divided into blocks of a square of 30''x30'', each of which is further divided into units of a square of 1''x1'', so that a region on the map can be hierarchically designated. Each section is defined with section codes of three digits; each block is defined with block codes of three digits in accordance with the relative positional relation in the section; and each unit is defined with unit codes of three digits in accordance with the relative positional relation in the block, so that each unit can be completely differentiated with nine digits composed of those three kinds of codes. Furthermore, an area code is added to those three codes to constitute an intrinsic code, so that an area including the certain unit is also designated.
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