{
  "name": "Datum gaps and accuracies, with sources",
  "desc": "Each difference or accuracy mentioned on the page, in meters, with its source and what kind of number it is: computed here, a performance standard, or a value stated by the source.",
  "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": [
    "National Geodetic Survey, NADCON5 grids nad27.nad83_1986.conus (release 20160901), public domain",
    "GPS Standard Positioning Service Performance Standard, 5th edition (April 2020)",
    "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)",
    "PROJ 9.8.1 src/ellps.cpp (WGS 84, GRS 80 and Clarke 1866 ellipsoids; WGS 84 values from NGA TR8350.2), MIT license"
  ],
  "how": "Compiled by The Yardstick Almanac from the data listed",
  "data_by": [
    "National Geodetic Survey, NADCON5 grids nad27.nad83_1986.conus (release 20160901), public domain; GPS Standard Positioning Service Performance Standard, 5th edition (April 2020); 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); PROJ 9.8.1 src/ellps.cpp (WGS 84, GRS 80 and Clarke 1866 ellipsoids; WGS 84 values from NGA TR8350.2), MIT license; computed 2026-11-01, CC BY 4.0"
  ]
}