{
  "retrieved": "2026-09-08",
  "source": "https://registry.opendata.aws/terrain-tiles/",
  "format": "Terrarium R*256+G+B/256-32768 meters",
  "zoom": 14,
  "gridSpacingMeters": 25.0,
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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",
  "map": {
    "retrieved": "2026-09-08",
    "source": "OpenStreetMap via Overpass API",
    "query": "[out:json][timeout:90];(way[\"waterway\"=\"river\"](31.208050664750267,121.45348206639254,31.26194933524973,121.51651793360746);way[\"highway\"~\"^(motorway|trunk|primary)$\"](31.091270212001437,121.31690435409352,31.378729787998562,121.65309564590648);way[\"building\"](31.212542220625224,121.45873505532711,31.257457779374775,121.51126494467289););out geom;",
    "sha256": "2cca8c155496f8489bc2b1c3aadbe5b376223a1af10801524d12fa6538e34229",
    "attribution": "© OpenStreetMap contributors, ODbL",
    "coverage": "Major road centerlines within central 32km; buildings within central 5km; river centerlines within terrain window. Incomplete OSM coverage; line vertices outside render extent omitted; remaining contiguous runs kept without bridging gaps."
  },
  "groundExaggeration": 0,
  "groundRepresentation": "Schematic flat datum; urban elevation artifacts not rendered, no street gradient claim",
  "buildingExaggeration": 1.5,
  "riverWidths": "Display ribbon widths, not surveyed banks",
  "flow": {
    "representation": "Downstream illustration on Huangpu OSM node order, not live flow; tidal reversal is not simulated",
    "source": "https://zjw.sh.gov.cn/shsd/userfiles/70%E5%9F%8E%E5%B8%82%E6%8E%92%E6%B0%B4%E6%B3%B5%E7%AB%99%E8%AE%BE%E8%AE%A1%E8%A7%84%E7%A8%8B.pdf"
  },
  "geographySource": "https://www.shanghai.gov.cn/nw44391/20200824/0001-44391_58087.html"
}