发明名称 PROCESS AND DEVICE FOR DETERMINING AN ITINERARY BETWEEN A STARTING AND A DESTINATION POINT
摘要 <p>In process for determining an itinerary between a starting point and a destination point that are both situated within a digitally recorded street network, there is the problem of carrying out the necessary calculations to determine the itinerary in a short time also in the case of extensive street networks. Otherwise the results may be obtained too late and not help the driver to make a decision. This problem is solved by dividing and recording the street network into at least two levels of different mesh densities and regional sizes, several smaller partial areas with a finer mesh density being arranged on the lower level and one or more larger partial areas with a larger mesh density being arranged on the higher level. A possible intinerary is then sought at first on the lower level of the street network and if the result is negative the search is carried out on the next higher level until a positive result is obtained. The itinerary is then determined on the level in which a positive result was obtained, for example on the same level or up and down between levels.</p>
申请公布号 WO1988009974(A1) 申请公布日期 1988.12.15
申请号 DE1988000329 申请日期 1988.06.04
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