Patent ID: 7949466
Filing Date: 2011-05-24
Classification: G01C

Abstract:
1. A map data providing device in a vehicle, comprising: a vehicle position detecting unit configured to detect an absolute position of the vehicle; a storing unit configured to store absolute positions of the vehicle detected by the vehicle position detecting unit while the vehicle runs as vehicular swept path data pertaining to the vehicle; a correction information computing unit configured to compare the vehicular swept path data with electronic map data representing a road map and compute correction information representing an amount of deviation of the electronic map data from the vehicular swept path data with respect to an area where the vehicle is positioned; a first correcting unit configured to correct the electronic map data using the correction information computed by the correction information computing unit; and a first map data providing unit configured to provide the electronic map data corrected by the first correcting unit, wherein the correction information computing unit computes, as the correction information, an offset correction amount and a rotation correction amount, the first correcting unit corrects the electronic map data using the offset correction amount and the rotation correction amount.