{
  "name": "Clarke 1866, GRS 80 and WGS 84 ellipsoids",
  "desc": "Equatorial radius, polar radius and inverse flattening of the ellipsoids used by NAD 27, NAD 83 and WGS 84, with each one's difference from WGS 84.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "The Yardstick Almanac",
  "url": "https://theyardstickalmanac.com/maps/wgs-84/",
  "from": [
    "PROJ 9.8.1 src/ellps.cpp (WGS 84, GRS 80 and Clarke 1866 ellipsoids; WGS 84 values from NGA TR8350.2), MIT license",
    "EPSG Geodetic Parameter Dataset v12.029, as distributed with PROJ 9.8.1 (transformations 1188 and 8555, datum ensemble 6326)"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "PROJ 9.8.1 src/ellps.cpp (WGS 84, GRS 80 and Clarke 1866 ellipsoids; WGS 84 values from NGA TR8350.2), MIT license; EPSG Geodetic Parameter Dataset v12.029, as distributed with PROJ 9.8.1 (transformations 1188 and 8555, datum ensemble 6326); computed 2026-11-01, CC BY 4.0"
  ]
}