Storage device, navigation device, and map database creation method

摘要

A storage device includes a map database having at least two specified sub-blocks and at least one non-specified sub-block. Each specified sub-block is correlated to a measurement position coordinate obtained from an external server by a measurement. The measurement position coordinate of each specified sub-block is stored in the storage device. The non-specified sub-block is directly or indirectly sandwiched by the two specified sub-blocks along a road. A measurement position coordinate of the non-specified sub-block is stored in the storage device when a distance between the measurement position coordinate and an estimation position coordinate of the non-specified sub-block is equal to or longer than a predetermined distance, and the measurement position coordinate of the non-specified sub-block is not stored in the storage device when the distance between the measurement position coordinate and the estimation position coordinate of the non-specified sub-block is shorter than the predetermined distance.

主权项

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, wherein the 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 to
store, 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.