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Storage device, navigation device, and map database creation method

  • US 9,506,760 B2
  • Filed: 07/29/2013
  • Issued: 11/29/2016
  • Est. Priority Date: 08/02/2012
  • Status: Active Grant
First Claim
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1. A map database storage device for a navigation apparatus of a vehicle, the map database storage device comprising:

  • a processor; and

    a map database storage coupled to the processor, the map database storage storing therein a map database, whereinthe map database includes a plurality of link data of a plurality of links that correspond to a plurality of roads, and each of the plurality of links connects two adjacent nodes,the map database includes at least two specified sub-blocks and at least one non-specified sub-block,each of the two specified sub-blocks is correlated to a measurement position coordinate obtained from an external source, the measurement position coordinate is a position coordinate obtained by a measurement,the map database further includes (i) the measurement position coordinate of each of the two specified sub-blocks, and (ii) the plurality of link data for specifying a position coordinate of the non-specified sub-block, the plurality of link data and the measurement position coordinates are stored in different storage locations from each other in the map database,the non-specified sub-block is directly or indirectly sandwiched by the two specified sub-blocks along one of the plurality of roads,the processor is configured tostore, in the map database storage, a measurement position coordinate of the non-specified sub-block when a distance between the measurement position coordinate of the non-specified sub-block and an estimation position coordinate of the non-specified sub-block is determined to be equal to or longer than a predetermined distance, the measurement position coordinate of the non-specified sub-block is obtained from the external source and the estimation position coordinate of the non-specified sub-block is calculated by a proportion calculation based on the measurement position coordinates of the two specified sub-block, andnot store, in the map database storage, the measurement position coordinate of the non-specified sub-block when the distance between the measurement position coordinate of the non-specified sub-block and the estimation position coordinate of the non-specified sub-block is determined to be shorter than the predetermined distance.

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