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Method: NTv2
Grid Files: SK83-98.gsb
Remarks: Parameter file is from NAD83 to NAD83(CSRS)v2 (2) (code 9887) assuming that NAD83(CSRS)v2 is equivalent to WGS 84 within the accuracy of the transformation.
Information source: OGP
Revision date: 2021-11-04
Unit: metre
Geodetic CRS: NAD83
Datum: North American Datum 1983
Ellipsoid: GRS 1980
Prime meridian: Greenwich
Data source: EPSG
Revision date: 1995-06-02
Scope: Engineering survey, topographic mapping.
Area of use: United States (USA) - Alaska - east of 141°W; i.e. Panhandle.
Coordinate system: Cartesian 2D CS. Axes: easting, northing (X,Y). Orientations: east, north. UoM: m.
Definition: OGC Well Known Text
PROJCS["NAD83 / Alaska zone 1", GEOGCS["NAD83", DATUM["North_American_Datum_1983", SPHEROID["GRS 1980",6378137,298.257222101], EXTENSION["PROJ4_GRIDS","SK83-98.gsb"]], PRIMEM["Greenwich",0, AUTHORITY["EPSG","8901"]], UNIT["degree",0.0174532925199433, AUTHORITY["EPSG","9122"]], AUTHORITY["EPSG","4269"]], PROJECTION["Hotine_Oblique_Mercator"], PARAMETER["latitude_of_center",57], PARAMETER["longitude_of_center",-133.666666666667], PARAMETER["azimuth",323.130102361111], PARAMETER["rectified_grid_angle",323.130102361111], PARAMETER["scale_factor",0.9999], PARAMETER["false_easting",5000000], PARAMETER["false_northing",-5000000], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AXIS["Easting",EAST], AXIS["Northing",NORTH], AUTHORITY["EPSG","26931"]]
Definition: OGC Well Known Text 2 (2019)
BOUNDCRS[ SOURCECRS[ PROJCRS["NAD83 / Alaska zone 1", BASEGEOGCRS["NAD83", DATUM["North American Datum 1983", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",4269]], CONVERSION["SPCS83 Alaska zone 1 (meter)", METHOD["Hotine Oblique Mercator (variant A)", ID["EPSG",9812]], PARAMETER["Latitude of projection centre",57, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8811]], PARAMETER["Longitude of projection centre",-133.666666666667, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8812]], PARAMETER["Azimuth of initial line",323.130102361111, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8813]], PARAMETER["Angle from Rectified to Skew Grid",323.130102361111, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8814]], PARAMETER["Scale factor on initial line",0.9999, SCALEUNIT["unity",1], ID["EPSG",8815]], PARAMETER["False easting",5000000, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",-5000000, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["easting (X)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["northing (Y)",north, ORDER[2], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Engineering survey, topographic mapping."], AREA["United States (USA) - Alaska - east of 141°W; i.e. Panhandle."], BBOX[54.61,-141,60.35,-129.99]], ID["EPSG",26931]]], TARGETCRS[ GEOGCRS["WGS 84", ENSEMBLE["World Geodetic System 1984 ensemble", MEMBER["World Geodetic System 1984 (Transit)"], MEMBER["World Geodetic System 1984 (G730)"], MEMBER["World Geodetic System 1984 (G873)"], MEMBER["World Geodetic System 1984 (G1150)"], MEMBER["World Geodetic System 1984 (G1674)"], MEMBER["World Geodetic System 1984 (G1762)"], MEMBER["World Geodetic System 1984 (G2139)"], ELLIPSOID["WGS 84",6378137,298.257223563, LENGTHUNIT["metre",1]], ENSEMBLEACCURACY[2.0]], 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]], USAGE[ SCOPE["Horizontal component of 3D system."], AREA["World."], BBOX[-90,-180,90,180]], ID["EPSG",4326]]], ABRIDGEDTRANSFORMATION["NAD83 to WGS 84 (7)", METHOD["NTv2", ID["EPSG",9615]], PARAMETERFILE["Latitude and longitude difference file","SK83-98.gsb"], USAGE[ SCOPE["(null/copy) Approximation for medium and low accuracy applications assuming equality between plate-fixed static and earth-fixed dynamic CRSs, ignoring static/dynamic CRS differences."], AREA["Canada - Saskatchewan."], BBOX[49,-110,60.01,-101.34]], ID["EPSG",1697], REMARK["Parameter file is from NAD83 to NAD83(CSRS)v2 (2) (code 9887) assuming that NAD83(CSRS)v2 is equivalent to WGS 84 within the accuracy of the transformation."]]]
Definition: ESRI Well Known Text
PROJCS["NAD_1983_StatePlane_Alaska_1_FIPS_5001", GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980",6378137.0,298.257222101], EXTENSION["PROJ4_GRIDS","SK83-98.gsb"]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Hotine_Oblique_Mercator_Azimuth_Natural_Origin"], PARAMETER["False_Easting",5000000.0], PARAMETER["False_Northing",-5000000.0], PARAMETER["Scale_Factor",0.9999], PARAMETER["Azimuth",-36.869897638889], PARAMETER["Longitude_Of_Center",-133.666666666667], PARAMETER["Latitude_Of_Center",57.0], UNIT["Meter",1.0]]
Definition: JavaScript (Proj4js)
proj4.defs("EPSG:26931","+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +ellps=GRS80 +nadgrids=SK83-98.gsb +units=m +no_defs +type=crs");
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "BoundCRS", "source_crs": { "type": "ProjectedCRS", "name": "NAD83 / Alaska zone 1", "base_crs": { "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 } }, "conversion": { "name": "SPCS83 Alaska zone 1 (meter)", "method": { "name": "Hotine Oblique Mercator (variant A)", "id": { "authority": "EPSG", "code": 9812 } }, "parameters": [ { "name": "Latitude of projection centre", "value": 57, "unit": "degree", "id": { "authority": "EPSG", "code": 8811 } }, { "name": "Longitude of projection centre", "value": -133.666666666667, "unit": "degree", "id": { "authority": "EPSG", "code": 8812 } }, { "name": "Azimuth of initial line", "value": 323.130102361111, "unit": "degree", "id": { "authority": "EPSG", "code": 8813 } }, { "name": "Angle from Rectified to Skew Grid", "value": 323.130102361111, "unit": "degree", "id": { "authority": "EPSG", "code": 8814 } }, { "name": "Scale factor on initial line", "value": 0.9999, "unit": "unity", "id": { "authority": "EPSG", "code": 8815 } }, { "name": "False easting", "value": 5000000, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": -5000000, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "X", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "Y", "direction": "north", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 26931 } }, "target_crs": { "type": "GeographicCRS", "name": "WGS 84", "datum_ensemble": { "name": "World Geodetic System 1984 ensemble", "members": [ { "name": "World Geodetic System 1984 (Transit)", "id": { "authority": "EPSG", "code": 1166 } }, { "name": "World Geodetic System 1984 (G730)", "id": { "authority": "EPSG", "code": 1152 } }, { "name": "World Geodetic System 1984 (G873)", "id": { "authority": "EPSG", "code": 1153 } }, { "name": "World Geodetic System 1984 (G1150)", "id": { "authority": "EPSG", "code": 1154 } }, { "name": "World Geodetic System 1984 (G1674)", "id": { "authority": "EPSG", "code": 1155 } }, { "name": "World Geodetic System 1984 (G1762)", "id": { "authority": "EPSG", "code": 1156 } }, { "name": "World Geodetic System 1984 (G2139)", "id": { "authority": "EPSG", "code": 1309 } } ], "ellipsoid": { "name": "WGS 84", "semi_major_axis": 6378137, "inverse_flattening": 298.257223563 }, "accuracy": "2.0", "id": { "authority": "EPSG", "code": 6326 } }, "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": 4326 } }, "transformation": { "name": "NAD83 to WGS 84 (7)", "method": { "name": "NTv2", "id": { "authority": "EPSG", "code": 9615 } }, "parameters": [ { "name": "Latitude and longitude difference file", "value": "SK83-98.gsb", "id": { "authority": "EPSG", "code": 8656 } } ], "id": { "authority": "EPSG", "code": 1697 } } }
Definition: GeoServer
26931=PROJCS["NAD83 / Alaska zone 1",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GRS 1980",6378137,298.257222101],EXTENSION["PROJ4_GRIDS","SK83-98.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],PROJECTION["Hotine_Oblique_Mercator"],PARAMETER["latitude_of_center",57],PARAMETER["longitude_of_center",-133.666666666667],PARAMETER["azimuth",323.130102361111],PARAMETER["rectified_grid_angle",323.130102361111],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",5000000],PARAMETER["false_northing",-5000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","26931"]]
Definition: MapServer - MAPfile
PROJECTION "proj=omerc" "no_uoff" "lat_0=57" "lonc=-133.666666666667" "alpha=323.130102361111" "gamma=323.130102361111" "k=0.9999" "x_0=5000000" "y_0=-5000000" "ellps=GRS80" "nadgrids=SK83-98.gsb" "units=m" "no_defs" "type=crs" END
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +ellps=GRS80 +nadgrids=SK83-98.gsb +units=m +no_defs +type=crs"> <Layer srs="+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +ellps=GRS80 +nadgrids=SK83-98.gsb +units=m +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 26931, 'EPSG', 26931, '+proj=omerc +no_uoff +lat_0=57 +lonc=-133.666666666667 +alpha=323.130102361111 +gamma=323.130102361111 +k=0.9999 +x_0=5000000 +y_0=-5000000 +ellps=GRS80 +nadgrids=SK83-98.gsb +units=m +no_defs +type=crs', 'PROJCS["NAD83 / Alaska zone 1",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GRS 1980",6378137,298.257222101],EXTENSION["PROJ4_GRIDS","SK83-98.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],PROJECTION["Hotine_Oblique_Mercator"],PARAMETER["latitude_of_center",57],PARAMETER["longitude_of_center",-133.666666666667],PARAMETER["azimuth",323.130102361111],PARAMETER["rectified_grid_angle",323.130102361111],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",5000000],PARAMETER["false_northing",-5000000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","26931"]]');
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