Fig. 2: Segment map drawing, including two steps.

First, defining segments by dividing road centerlines at junctions. Second, merging short segments or those with zero check-ins into adjacent segments with the least angular deviation or the highest image similarity (e.g., openness, building arrangement, facade materials) to enhance statistical analysis. The merged segments are marked by elliptical masks in different colors, each representing a corresponding reason, as indicated in the legend.