| 摘要 |
The invention relates to a map bearing a graphic representation of cartographical information, broken down into a large number of elementary areas with which are associated respectively a large number of indexes. According to the invention, each index includes a group of dots (10) placed on the map in the vicinity of the associated elementary area and forming a specific code for the said area, the indexes as a whole forming a location frame covering the said geographical representation and superimposed thereupon, each group of dots being readable by optical reading means cooperating with a data processing system comprising a data medium addressable by means of the said indexes.
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