Geodesy.
In CONUS, American Samoa and Guam replaced by NAD83(FBN). In Alaska replaced by NAD83(NSRS2007). In Hawaii replaced by NAD83(PA11). In Puerto Rico and US Virgin Islands replaced by NAD83(HARN Corrected).
Definition: OGC Well Known Text 2 (2019)
DATUM["NAD83 (High Accuracy Reference Network)", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]], ID["EPSG",6152]]
Definition: ESRI Well Known Text
DATUM["D_North_American_1983_HARN", SPHEROID["GRS_1980",6378137.0,298.257222101]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "NAD83 (High Accuracy Reference Network)", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Geodesy.", "area": "American Samoa - onshore - Tutuila, Aunu'u, Ofu, Olesega, Ta'u and Rose islands. Guam - onshore. Northern Mariana Islands - onshore. Puerto Rico - onshore. United States (USA) - onshore Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming; offshore Gulf of Mexico continental shelf (GoM OCS). US Virgin Islands - onshore.", "bbox": { "south_latitude": -14.59, "west_longitude": 144.58, "north_latitude": 71.4, "east_longitude": -64.51 }, "id": { "authority": "EPSG", "code": 6152 } }