Fig. 1. Workflow of this study
Fig. 2. Extraction process for matching pair of road centerlines between different scales
Fig. 3. Road centerline of digital topographic map at 1:5,000 (left) and 1:25,000 (right) scale for target area of training data (all over Giheung-gu, Yongin-si)
Fig. 4. Histogram of SPF value for road network of test data
Fig. 5. Threshold estimation using total length of target line, the cumulative function of SPF and length of line
Fig. 7. An example of the discrepancy caused by gaps in the method that expresses a dual line as a single line (the matched line (black) and commission error (gray) of the proposed method)
Fig. 8. An example of the discrepancy caused by excessively expressed small road centerlines (the matched line (black) and commission error (gray) of the proposed method)
Fig. 6. An example of the discrepancy caused by gaps in the update period (the matched line (black) and commission error (gray) of the proposed method, The vertical road in the middle: a road object that was inserted after renewal of the NGII digital map)
Table 1. Attribute schema of reconstructed road centerline data
Table 2. Total length of the road network for the matching results between the selected road centreline from the two methods and the NGII map data
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