{
  "revision": 67,
  "classification": "Regional hill-structure source for an original scaled artistic lake scene; not a surveyed West Lake replica or present-day terrain guarantee.",
  "path": "/journey-lab-v4/hangzhou-67/geography/hangzhou-western-hills.f32",
  "width": 438,
  "height": 473,
  "bytes": 828696,
  "sha256": "05f8da44b4a060ab19f29e11a906d35ad80a63c01416415b16169f24c29f178a",
  "encoding": {
    "format": "headerless float32",
    "byteOrder": "little-endian",
    "units": "metres",
    "rowOrder": "north to south",
    "columnOrder": "west to east",
    "layout": "C row-major, offset=(row*width+column)*4",
    "sampleConvention": "Pixel centres: top-left centre is minX+step/2,maxY-step/2. Bounds describe outer pixel edges.",
    "noData": "No separate mask supplied by PNG. Raw full-tile margins are unfiltered; each grid reports outliers below-100m/above2500m. Requested crop must contain none; any raw outliers are not valid local relief."
  },
  "projection": "EPSG:3857 / Web Mercator, spherical radius6378137m; longitude/latitude bounds in WGS84 EPSG:4326, not GCJ-02.",
  "mercatorBounds": {
    "minX": 13357217.818777978,
    "minY": 3521530.3301263545,
    "maxX": 13373957.527972434,
    "maxY": 3539607.6873157993
  },
  "wgs84Bounds": {
    "west": 119.98992919921875,
    "south": 30.13978301029757,
    "east": 120.14030456542969,
    "north": 30.280119783700034
  },
  "heightRangeMetres": [
    -32.0,
    477.0
  ],
  "groundOutputSpacingMetresApprox": 33.027959212549376,
  "resolutionWarning": "Tile pixel spacing and 1/256m encoding are not native DEM resolution or accuracy. Terrarium is a resampled aggregate. SRTM filenames are tile-wide provenance, not a per-pixel source mask; no finer detail or native resolution is inferred from z12.",
  "processing": "Original RGB tiles decoded as R*256+G+B/256-32768. Mosaic concatenation and integer-pixel crop only; no interpolation, smoothing, height rebasing, sharpening or vertical exaggeration. Requested crop slightly encloses requested lon/lat bounds at exact source-pixel edges.",
  "license": {
    "basis": "Source-specific Mapzen/Tilezen attribution documentation; not blanket CC0 for the worldwide aggregate.",
    "upstreamEvidence": "Actual S3 imagery-source response headers preserved separately for every tile. The China sample lists SRTM, GMTED2010 and ETOPO1; these are tile-wide source lists, not a per-pixel attribution mask.",
    "terms": "Tilezen describes SRTM as public-domain USGS-distributed data while also reproducing an outside-US copyright notice. It describes GMTED2010 as public domain and ETOPO1 as U.S. Government material not subject to copyright within the United States. Preserve source-specific attribution and the complete policy reference; do not replace these terms with a global CC0 claim.",
    "credit": "Terrain tiles: Mapzen / Tilezen. SRTM and GMTED2010 data courtesy of the U.S. Geological Survey. ETOPO1 terrain data: U.S. National Oceanic and Atmospheric Administration (NOAA/NESDIS/NCEI).",
    "policyURL": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md"
  },
  "references": {
    "registry": "https://registry.opendata.aws/terrain-tiles/",
    "format": "https://github.com/tilezen/joerd/blob/master/docs/formats.md",
    "attribution": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md"
  },
  "acquisitionEvidence": "design/hangzhou-dem67/metadata.json and acquisition.json retain original HTTP source headers and tile SHA values.",
  "applicationTransform": "Explicit source-to-world transform and elevation datum are recorded by the runtime lake-bay-dem67 module, separately from this untouched raster."
}