| 摘要 |
In order to locate a spatial zone on a surface, said system uses a division of the surface into zones wherein: the surface is divided into three parts in two directions, that is into nine zones called first rank zones whereto a respective number from 1 to 9 is assigned; each zone of rank n is divided likewise into nine zones of rank n+1 whereto a respective number from 1 to 9 is assigned, a zone of rank n being located by a locating sequence comprising n figures containing the number of the zone to be located, and the numbers of all the zones of lower rank containing the zone to be located; said system comprising means to determine the locating sequence of a zone of rank n wherein is a zone Z to be located, n being the maximum value such that the surface of the zone Z is included in the zone of rank n, and means for manipulating such a sequence. |
