EPSG:8546

COORDINATEOPERATION["St. George Island to NAD83 (2)",
    VERSION["NGS-Usa AK StG Nadcon5"],
    SOURCECRS[
        GEOGCRS["St. George Island",
            DATUM["St. George Island",
                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",4138]]],
    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.sg1952.nad83_1986.stgeorge.lat.trn.20160901.b"],
    PARAMETERFILE["Longitude difference file","nadcon5.sg1952.nad83_1986.stgeorge.lon.trn.20160901.b"],
    OPERATIONACCURACY[0.15],
    USAGE[
        SCOPE["Geodesy."],
        AREA["United States (USA) - Alaska - Pribilof Islands - St George Island."],
        BBOX[56.49,-169.88,56.67,-169.38]],
    ID["EPSG",8546],
    REMARK["Uses NADCON5 method which expects longitudes positive east in range 0-360°; EPSG source and target CRSs have longitudes positive east in range -180° to +180°."]]

proj4.defs("EPSG:8546","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=gridshift +grids=us_noaa_nadcon5_sg1952_nad83_1986_stgeorge.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "St. George Island to NAD83 (2)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "St. George Island",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "St. George Island",
            "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": 4138
        },
        "remarks": "Note: this CRS includes longitudes which are POSITIVE EAST."
    },
    "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
        },
        "remarks": "Longitude is POSITIVE EAST. The adjustment included connections to Greenland and Mexico but the system was not adopted there. For applications with an accuracy of better than 1m replaced by NAD83(HARN) in the US and PRVI and by NAD83(CSRS) in Canada."
    },
    "method": {
        "name": "NADCON5 (2D)",
        "id": {
            "authority": "EPSG",
            "code": 1074
        }
    },
    "parameters": [
        {
            "name": "Latitude difference file",
            "value": "nadcon5.sg1952.nad83_1986.stgeorge.lat.trn.20160901.b",
            "id": {
                "authority": "EPSG",
                "code": 8657
            }
        },
        {
            "name": "Longitude difference file",
            "value": "nadcon5.sg1952.nad83_1986.stgeorge.lon.trn.20160901.b",
            "id": {
                "authority": "EPSG",
                "code": 8658
            }
        }
    ],
    "accuracy": "0.15",
    "scope": "Geodesy.",
    "area": "United States (USA) - Alaska - Pribilof Islands - St George Island.",
    "bbox": {
        "south_latitude": 56.49,
        "west_longitude": -169.88,
        "north_latitude": 56.67,
        "east_longitude": -169.38
    },
    "id": {
        "authority": "EPSG",
        "code": 8546
    },
    "remarks": "Uses NADCON5 method which expects longitudes positive east in range 0-360°; EPSG source and target CRSs have longitudes positive east in range -180° to +180°."
}

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=gridshift +grids=us_noaa_nadcon5_sg1952_nad83_1986_stgeorge.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1">
	<Layer srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=gridshift +grids=us_noaa_nadcon5_sg1952_nad83_1986_stgeorge.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8546, 'EPSG', 8546, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=gridshift +grids=us_noaa_nadcon5_sg1952_nad83_1986_stgeorge.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');