Geographic data transmitting method, information delivering apparatus and information terminal
First Claim
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1. A map data transmission method comprising:
- determining a recommended route extending from a current position to a destination;
extracting map data that include road shape information indicating shapes of roads and road connection information indicating conditions with which the roads connect with one another, over a slicing range set within a predetermined distance from the determined recommended route;
making a decision as to whether or not the road connection information is to be eliminated from the extracted map data based on;
(1) whether the extracted map data correspond to;
a) an urban area,b) an area with good GPS reception, orc) a road which does not connect with the recommended route;
or (2) whether an estimated total data size of the extracted ma data is greater than a predetermined value; and
transmitting the road shape information of the roads without corresponding road connection information if results of the decision indicate that the road connection information is to be eliminated.
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Abstract
A preferred route from a present place to a destination in decided based on geographical data including road shape information indicative of the shapes of roads and also including road connection information indicative of connection conditions between the roads, and then geographical data of areas existing within a predetermined distance from the decided preferred route are derived. Then, it is decided whether the road connection information should be deleted from the derived geographic data, and if so decided, the geographic data are transmitted with the road connection information deleted.
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Citations
21 Claims
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1. A map data transmission method comprising:
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determining a recommended route extending from a current position to a destination; extracting map data that include road shape information indicating shapes of roads and road connection information indicating conditions with which the roads connect with one another, over a slicing range set within a predetermined distance from the determined recommended route; making a decision as to whether or not the road connection information is to be eliminated from the extracted map data based on; (1) whether the extracted map data correspond to; a) an urban area, b) an area with good GPS reception, or c) a road which does not connect with the recommended route; or (2) whether an estimated total data size of the extracted ma data is greater than a predetermined value; and transmitting the road shape information of the roads without corresponding road connection information if results of the decision indicate that the road connection information is to be eliminated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A map data transmission method comprising:
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determining a recommended route extending from a current position to a destination; extracting map data that include road shape information indicating shapes of roads and road connection information indicating conditions with which the roads connect with one another, over a slicing range set within a predetermined distance from the determined recommended route; and transmitting the road shape information of the roads obtained by eliminating the road connection information corresponding to the roads from the extracted map data, if the extracted map data correspond to an area in which good GPS reception has been set.
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Specification