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  "attribution": "Mapzen; SRTM/GMTED2010 terrain data courtesy of the U.S. Geological Survey",
  "modifications": "bilinear resampling; gridSpacingMeters records sampling, not source accuracy; display scaling recorded in city metadata",
  "osm": {
    "source": "OpenStreetMap / Overpass API",
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    "attribution": "© OpenStreetMap contributors, ODbL"
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  "water": "Mapped polygons clipped to viewport, islands retained. DEM lowered beneath water; schematic fixed water levels, no live hydrology. Centerline direction follows OSM downstream node order.",
  "tower": "Modern Leifeng Pagoda silhouette study, 71m reference; uniformly enlarged 4x for visibility, not architectural survey.",
  "geography": "https://wgly.hangzhou.gov.cn/art/2020/8/12/art_1229505585_58935212.html",
  "pagoda": "https://wbdl.hzwbzx.cn/house?id=85",
  "tides": "https://ls.hangzhou.gov.cn/art/2025/6/7/art_1622550_59029625.html"
}