Fig. 1: The preprocessing of user-posted images ("check-ins”) obtained from the RedNote server, including filtering of exterior-irrelevant and user-reposted images.

Then, the sites in the remaining valid images are distinguished, counted, and georeferenced to the map. The illustration is created by the authors based on self-taken photographs (some of which were digitally enhanced using generative AI (DALL ⋅ E model) to include virtual human figures), representing conditions observed in publicly shared user-posted images, without directly displaying the original user content, in order to avoid potential copyright infringement.