Terminal apparatus for downloading map
First Claim
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1. A map data distribution method for a mobile body comprising the stops of:
- receiving coordinate information of a present place and destination of the mobile body from an on-board terminal;
retrieving a recommended route based on the received information of the present place and destination;
obtaining map data which is structured as a set of meshes including the recommended route from map data stored in a map data database, wherein each mesh of said set of meshes includes road information which is divided into a plurality of groups of information according to different types of roads such that information of roads of the same type are included in the same group; and
transmitting, as retrieved map data, the road information to the on-board terminal such that the groups of information are transmitted according to a predetermined order based on the different types of road.
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Abstract
A terminal apparatus has a simple map installed therein. When a map is desired, it is checked whether or not a map of a desired place exists in the simple map. If it exists, the map of the desired place is loaded from the simple map, or if it does not exist, the map of the desired place is downloaded from a navigation server.
19 Citations
5 Claims
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1. A map data distribution method for a mobile body comprising the stops of:
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receiving coordinate information of a present place and destination of the mobile body from an on-board terminal;
retrieving a recommended route based on the received information of the present place and destination;
obtaining map data which is structured as a set of meshes including the recommended route from map data stored in a map data database, wherein each mesh of said set of meshes includes road information which is divided into a plurality of groups of information according to different types of roads such that information of roads of the same type are included in the same group; and
transmitting, as retrieved map data, the road information to the on-board terminal such that the groups of information are transmitted according to a predetermined order based on the different types of road. - View Dependent Claims (2)
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3. A map data server comprising:
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means for receiving a map retrieval demand including positional information of a destination or a place on a route and positional information of a present place of a mobile body from an on-board terminal and for transmitting retrieved map data to the on-board terminal;
means for retrieving a recommended route based on the positional information of the destination or the place on the route and the positional information of the present place of the received map retrieval demand; and
a map information section including a map cut out means to obtain map data which is structured as a set of meshes including the recommended route from map data stored in a map data database, wherein said map information section divides road information included in each of the meshes into a plurality of groups of information according to different types of roads such that information of roads of the same type are included in the same group, and transmits as the retrieval map data the road information to the on-board terminal such that the groups of information are transmitted according to a predetermined order based on the different types of roads. - View Dependent Claims (4, 5)
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Specification