{
  "name": "NOAA ETOPO 2022",
  "version": "v1",
  "variant": "60s ice surface elevation",
  "nativeWidth": 21600,
  "nativeHeight": 10800,
  "nativeArcseconds": 60,
  "tileSize": 512,
  "gutter": 2,
  "encoding": "int16-le-gzip",
  "units": "metres",
  "verticalDatum": "EGM2008",
  "bounds": [
    -180,
    -90,
    180,
    90
  ],
  "levels": [
    {
      "width": 1024,
      "height": 512,
      "minimum": -9128,
      "maximum": 6010,
      "tiles": 2,
      "bytes": 858502
    },
    {
      "width": 2048,
      "height": 1024,
      "minimum": -9966,
      "maximum": 6233,
      "tiles": 8,
      "bytes": 3298411
    },
    {
      "width": 4096,
      "height": 2048,
      "minimum": -10359,
      "maximum": 6367,
      "tiles": 32,
      "bytes": 12425448
    },
    {
      "width": 8192,
      "height": 4096,
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      "maximum": 7170,
      "tiles": 128,
      "bytes": 46050625
    },
    {
      "width": 21600,
      "height": 10800,
      "minimum": -10752,
      "maximum": 8157,
      "tiles": 946,
      "bytes": 285325854
    }
  ],
  "sourceUrl": "https://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2022/data/60s/60s_surface_elev_gtif/ETOPO_2022_v1_60s_N90W180_surface.tif",
  "citation": "NOAA National Centers for Environmental Information. 2022: ETOPO 2022 15 Arc-Second Global Relief Model. doi:10.25921/fd45-gt74. Uses its published 60 arc-second surface grid.",
  "license": "CC0-1.0",
  "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
  "sourceSha256": "9d27d4b8ea8e76977e2988bca667d7c8fa68b927355feffcddd6b4875a7fd08e",
  "preparedAt": "2026-09-09T16:26:28.441527+00:00",
  "processing": "Lower levels average source grid elevations; native level is not spatially downsampled. All levels round to signed integer metres. Longitude gutters wrap; polar gutters repeat the nearest source row. Globe shape remains spherical, not displaced terrain."
}