{
  "source": "NOAA NCEI WMM2025 test values",
  "source_url": "https://www.ncei.noaa.gov/sites/default/files/2025-02/WMM2025testvalues.pdf",
  "height_reference": "WGS84 ellipsoid",
  "note": "Normalized subset of six official surface test vectors at epochs 2025.0 and 2027.5.",
  "vectors": [
    {
      "year": 2025,
      "height_km": 0,
      "lat": 80,
      "lon": 0,
      "X": 6521.6,
      "Y": 145.9,
      "Z": 54791.5,
      "H": 6523.2,
      "F": 55178.5,
      "I": 83.21,
      "D": 1.28,
      "Xdot": -8.3,
      "Ydot": 59.5,
      "Zdot": 31.1,
      "Hdot": -7,
      "Fdot": 30.1,
      "Idot": 0.01,
      "Ddot": 0.52
    },
    {
      "year": 2025,
      "height_km": 0,
      "lat": 0,
      "lon": 120,
      "X": 39677.8,
      "Y": -109.6,
      "Z": -10580.2,
      "H": 39677.9,
      "F": 41064.3,
      "I": -14.93,
      "D": -0.16,
      "Xdot": 9.5,
      "Ydot": -23.1,
      "Zdot": 79.4,
      "Hdot": 9.6,
      "Fdot": -11.2,
      "Idot": 0.11,
      "Ddot": -0.03
    },
    {
      "year": 2025,
      "height_km": 0,
      "lat": -80,
      "lon": 240,
      "X": 6117.5,
      "Y": 15751.9,
      "Z": -52022.5,
      "H": 16898.1,
      "F": 54698.2,
      "I": -72,
      "D": 68.78,
      "Xdot": 33.3,
      "Ydot": -8.6,
      "Zdot": 95.5,
      "Hdot": 4,
      "Fdot": -89.6,
      "Idot": 0.03,
      "Ddot": -0.12
    },
    {
      "year": 2027.5,
      "height_km": 0,
      "lat": 80,
      "lon": 0,
      "X": 6500.8,
      "Y": 294.5,
      "Z": 54869.4,
      "H": 6507.5,
      "F": 55253.9,
      "I": 83.24,
      "D": 2.59,
      "Xdot": -8.3,
      "Ydot": 59.5,
      "Zdot": 31.1,
      "Hdot": -5.6,
      "Fdot": 30.3,
      "Idot": 0.01,
      "Ddot": 0.53
    },
    {
      "year": 2027.5,
      "height_km": 0,
      "lat": 0,
      "lon": 120,
      "X": 39701.6,
      "Y": -167.4,
      "Z": -10381.8,
      "H": 39702,
      "F": 41036.9,
      "I": -14.65,
      "D": -0.24,
      "Xdot": 9.5,
      "Ydot": -23.1,
      "Zdot": 79.4,
      "Hdot": 9.6,
      "Fdot": -10.7,
      "Idot": 0.11,
      "Ddot": -0.03
    },
    {
      "year": 2027.5,
      "height_km": 0,
      "lat": -80,
      "lon": 240,
      "X": 6200.7,
      "Y": 15730.3,
      "Z": -51783.7,
      "H": 16908.3,
      "F": 54474.2,
      "I": -71.92,
      "D": 68.49,
      "Xdot": 33.3,
      "Ydot": -8.6,
      "Zdot": 95.5,
      "Hdot": 4.2,
      "Fdot": -89.5,
      "Idot": 0.04,
      "Ddot": -0.12
    }
  ]
}