| 摘要 |
<p>The method involves centralizing geographical data (1,A,B,C,D,E,F) as map units (2,3,4,5). The map units are hierarchically structured. The map units correspond to an n arrangement of each of a geographical partial area, where n is a natural number. The map units correspond to an (n+1) arrangement of each of a geographical subarea of one of the partial areas. A designated map unit (4) is replaced by a map unit having updated geographical data.</p> |
