{
  "name": "Calibration card: WGS 84",
  "desc": "The values in the Calibration card at the top of the page, one field per row, with the source of each value.",
  "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)",
    "National Geodetic Survey, New Datums web page (read 2026-11-01)",
    "National Geodetic Survey, NADCON5 grids nad27.nad83_1986.conus (release 20160901), public domain",
    "GPS Standard Positioning Service Performance Standard, 5th edition (April 2020)"
  ],
  "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); National Geodetic Survey, New Datums web page (read 2026-11-01); National Geodetic Survey, NADCON5 grids nad27.nad83_1986.conus (release 20160901), public domain; GPS Standard Positioning Service Performance Standard, 5th edition (April 2020); computed 2026-11-01, CC BY 4.0"
  ]
}