Geodetic CRS: NAD27
Datum: North American Datum 1927
Ellipsoid: Clarke 1866
Prime meridian: Greenwich
Data source: EPSG
Information source: National Geodetic Survey, www.ngs.noaa.gov
Revision date: 2019-09-17
Scope: Geodesy.
Remarks: Uses NADCON5 method which expects longitudes positive east in range 0-360°; source and target CRSs have longitudes positive east in range -180° to +180°. Accuracy at 67% confidence level is 0.5m onshore, 5m nearshore and undetermined farther offshore.
Method: NADCON5 (2D)
Area of use: United States (USA) - Alaska.
Description: (0,)
Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["NAD27 to NAD83 (8)", VERSION["NGS-Usa AK Nadcon5"], SOURCECRS[ GEOGCRS["NAD27", DATUM["North American Datum 1927", ELLIPSOID["Clarke 1866",6378206.4,294.978698213898, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4267]]], TARGETCRS[ GEOGCRS["NAD83", DATUM["North American Datum 1983", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,2], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4269]]], METHOD["NADCON5 (2D)", ID["EPSG",1074]], PARAMETERFILE["Latitude difference file","nadcon5.nad27.nad83_1986.alaska.lat.trn.20160901.b"], PARAMETERFILE["Longitude difference file","nadcon5.nad27.nad83_1986.alaska.lon.trn.20160901.b"], OPERATIONACCURACY[0.5], USAGE[ SCOPE["Geodesy."], AREA["United States (USA) - Alaska."], BBOX[51.3,172.42,71.4,-129.99]], ID["EPSG",8549], REMARK["Uses NADCON5 method which expects longitudes positive east in range 0-360°; source and target CRSs have longitudes positive east in range -180° to +180°. Accuracy at 67% confidence level is 0.5m onshore, 5m nearshore and undetermined farther offshore."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json", "type": "Transformation", "name": "NAD27 to NAD83 (8)", "source_crs": { "type": "GeographicCRS", "name": "NAD27", "datum": { "type": "GeodeticReferenceFrame", "name": "North American Datum 1927", "ellipsoid": { "name": "Clarke 1866", "semi_major_axis": 6378206.4, "semi_minor_axis": 6356583.8 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 4267 } }, "target_crs": { "type": "GeographicCRS", "name": "NAD83", "datum": { "type": "GeodeticReferenceFrame", "name": "North American Datum 1983", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" } ] }, "id": { "authority": "EPSG", "code": 4269 } }, "method": { "name": "NADCON5 (2D)", "id": { "authority": "EPSG", "code": 1074 } }, "parameters": [ { "name": "Latitude difference file", "value": "nadcon5.nad27.nad83_1986.alaska.lat.trn.20160901.b", "id": { "authority": "EPSG", "code": 8657 } }, { "name": "Longitude difference file", "value": "nadcon5.nad27.nad83_1986.alaska.lon.trn.20160901.b", "id": { "authority": "EPSG", "code": 8658 } } ], "accuracy": "0.5", "scope": "Geodesy.", "area": "United States (USA) - Alaska.", "bbox": { "south_latitude": 51.3, "west_longitude": 172.42, "north_latitude": 71.4, "east_longitude": -129.99 }, "id": { "authority": "EPSG", "code": 8549 }, "remarks": "Uses NADCON5 method which expects longitudes positive east in range 0-360°; source and target CRSs have longitudes positive east in range -180° to +180°. Accuracy at 67% confidence level is 0.5m onshore, 5m nearshore and undetermined farther offshore." }