{
  "name": "Calibration card: U.S. survey foot",
  "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/units/us-survey-foot/",
  "from": [
    "Foot, yard, inch and pound definitions: National Bureau of Standards and U.S. Coast and Geodetic Survey notice, Federal Register 24 FR 5348 (July 1, 1959)",
    "Units built on the foot: NIST and NOAA notice, Federal Register 85 FR 62698 (October 5, 2020), Table 1",
    "Mendenhall Order of April 5, 1893, and the 1866 table, as reprinted in NBS Special Publication 447",
    "Exact relation 1 international foot = 0.999998 U.S. survey foot: NIST Special Publication 811 (2008), sec. B.6"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "24 FR 5348 (1959), 85 FR 62698 (2020), the Mendenhall Order (1893) and NIST SP 811 (2008); values computed 2026-11-01, CC BY 4.0"
  ]
}