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  "buildingCount": 857,
  "water": "Mapped river banks and lake outlines, preserved island holes. Fixed artistic level. Trails follow mapped routes with a slow artistic tidal reversal, not real-time current or flood prediction.",
  "terrain": "Own 58.33m sampled DEM, Gaussian 1.1, 5x relative relief, 80m bank feather. DEM may retain built-environment artifacts; not bare-earth lidar.",
  "buildings": "Limited actual footprint sample near Zhujiang New Town. Height tags or levels x 3m, missing height assumed 9m, capped 180m. Landmark Canton Tower overrides generic buildings. Not complete city or surveyed facades.",
  "landmarks": "Canton Tower: mapped building footprint, 24 twisted columns and 46 rings as an architectural silhouette, vertically 1.5x and footprint 1.25x. Haixin Bridge uses mapped pedestrian deck path and an illustrative arch, not structural reconstruction.",
  "sources": [
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    "https://wglj.gz.gov.cn/ztmb/gzhyn/ajjq/4a/content/post_8928935.html",
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    "https://sthjj.gz.gov.cn/attachment/7/7418/7418258/9158613.pdf",
    "https://swj.gz.gov.cn/zzfw/tzgg/content/post_10315662.html"
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}