{
  "name": "NAD 27 to NAD 83 shift at 823 points in the lower 48 states",
  "desc": "One row per whole-degree latitude and longitude point inside the outlines of the 48 conterminous states and the District of Columbia (823 points; the outlines include each state's Great Lakes waters): the change in latitude and longitude and the ground distance between the spots that pair names in NAD 27 and in NAD 83, computed by two independent methods, with the standard NAD 83 to WGS 84 step (0 m, stated accuracy 4 m).",
  "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",
    "PROJ-data us_noaa_nadcon5_nad27_nad83_1986_conus.tif (the same NADCON5 grid), public domain",
    "EPSG Geodetic Parameter Dataset v12.029, as distributed with PROJ 9.8.1 (transformations 1188 and 8555, datum ensemble 6326)",
    "Natural Earth 1:50m Admin 1 – States, Provinces, version 5.1.2, public domain"
  ],
  "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; PROJ-data us_noaa_nadcon5_nad27_nad83_1986_conus.tif (the same NADCON5 grid), public domain; EPSG Geodetic Parameter Dataset v12.029, as distributed with PROJ 9.8.1 (transformations 1188 and 8555, datum ensemble 6326); Natural Earth 1:50m Admin 1 – States, Provinces, version 5.1.2, public domain; computed 2026-11-01, CC BY 4.0"
  ]
}