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In urban canyon where the GNSS signals are blocked by buildings, the accuracy of measured position significantly deteriorates. GIS\uddatabases have been frequently utilized to improve the accuracy of measured position using map matching approaches. In map matching,\udthe measured position is projected to the road links (centerlines) in this approach and the lateral error of measured position is\udreduced.\ud  \udBy the advancement in data acquision approaches, high definition maps which contain extra information, such as road lanes are generated.\udThese road lanes can be utilized to mitigate the positional error and improve the accuracy in position.\ud  \udIn this paper, the image content of a camera mounted on the platform is utilized to detect the road boundaries in the image. We\udapply color masks to detect the road marks, apply the Hough transform to fit lines to the left and right road boundaries, find the\udcorresponding road segment in GIS database, estimate the homography transformation between the global and image coordinates of\udthe road boundaries, and estimate the camera pose with respect to the global coordinate system.\ud  \udThe proposed approach is evaluated on a benchmark. The position is measured by a smartphone’s GPS receiver, images are taken from\udsmartphone’s camera and the ground truth is provided by using Real-Time Kinematic (RTK) technique. Results show the proposed\udapproach significantly improves the accuracy of measured GPS position. The error in measured GPS position with average and standard\uddeviation of 11.323 and 11.418 meters is reduced to the error in estimated postion with average and standard deviation of 6.725 and\ud5.899 meters

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

LANE LEVEL LOCALIZATION; USING IMAGES AND HD MAPS TO MITIGATE THE LATERAL ERROR