{
  "id": "etopo2022-magnetic-terrain-v2",
  "source": "NOAA NCEI ETOPO 2022 surface elevation, 60 arc-second grid",
  "sourceURL": "https://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2022/data/60s/60s_surface_elev_gtif/ETOPO_2022_v1_60s_N90W180_surface.tif",
  "sourcePage": "https://www.ncei.noaa.gov/products/etopo-global-relief-model",
  "sourceSHA256": "9d27d4b8ea8e76977e2988bca667d7c8fa68b927355feffcddd6b4875a7fd08e",
  "sourceVerticalReference": "EGM2008 geoid",
  "width": 512,
  "height": 256,
  "bounds": [
    -180,
    -90,
    180,
    90
  ],
  "encoding": "signed little-endian int16 meters; north-to-south rows, west-to-east columns, cell centers",
  "derivation": "Bilinear area downsampling from the 60 arc-second numeric grid, rounded to integer meters.",
  "asset": "etopo2022-512.i16",
  "bytes": 262144,
  "sha256": "b4bf6a9a561f9804e48e73b7abb601145894806a7be2c7eaf2ba338508e9ea48",
  "minMeters": -7703,
  "maxMeters": 5439,
  "presentation": {
    "verticalExaggeration": 24,
    "oceanSurface": "clamped to sea level",
    "meshSegments": [
      384,
      192
    ],
    "shading": "Low-angle hillshade over a displaced DEM; hue retains the fixed-height WMM field.",
    "field": "Original WMM2025 colors remain a separate fixed-height model at 4000 m above WGS84. No vertical-datum fusion or field recomputation on terrain.",
    "persistent": true,
    "sharedGeometry": "canonical day/night Earth, cloud shell and magnetic overlay"
  }
}