EPSG:10668

COORDINATEOPERATION["HD72 to ETRF2000 (2)",
    VERSION["BME-Hun"],
    SOURCECRS[
        GEOGCRS["HD72",
            DATUM["Hungarian Datum 1972",
                ELLIPSOID["GRS 1967",6378160,298.247167427,
                    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",4237]]],
    TARGETCRS[
        GEOGCRS["ETRF2000",
            DYNAMIC[
                FRAMEEPOCH[1989]],
            DATUM["European Terrestrial Reference Frame 2000",
                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",9067]]],
    METHOD["NTv2",
        ID["EPSG",9615]],
    PARAMETERFILE["Latitude and longitude difference file","hu_bme_hd72corr.gsb"],
    OPERATIONACCURACY[0.015],
    USAGE[
        SCOPE["Geodesy, engineering survey, topographic mapping."],
        AREA["Hungary."],
        BBOX[45.74,16.11,48.58,22.9]],
    ID["EPSG",10668],
    REMARK["Emulation to better than 2mm of the official SGO EHT transformation. ETRF2000 coordinates of the grid nodes were converted to HD72 using the online EHT tool. For cadastral and other legal purposes the official transformation (CT code 10663) must be used."]]

proj4.defs("EPSG:10668","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=hu_bme_hd72corr.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": "HD72 to ETRF2000 (2)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "HD72",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Hungarian Datum 1972",
            "ellipsoid": {
                "name": "GRS 1967",
                "semi_major_axis": 6378160,
                "inverse_flattening": 298.247167427
            }
        },
        "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": 4237
        },
        "remarks": "Replaced HD1909 (EPSG CRS code 3819)."
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "ETRF2000",
        "datum": {
            "type": "DynamicGeodeticReferenceFrame",
            "name": "European Terrestrial Reference Frame 2000",
            "frame_reference_epoch": 1989,
            "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": 9067
        },
        "remarks": "Replaces ETRF97 (code 9066). On the publication of ETRF2005 the EUREF Technical Working Group recommended ETRF2000 be the realization of ETRS89. ETRF2014 and ETRF2020 (codes 9069 and 10571) are technically superior to all earlier realizations of ETRS89."
    },
    "method": {
        "name": "NTv2",
        "id": {
            "authority": "EPSG",
            "code": 9615
        }
    },
    "parameters": [
        {
            "name": "Latitude and longitude difference file",
            "value": "hu_bme_hd72corr.gsb",
            "id": {
                "authority": "EPSG",
                "code": 8656
            }
        }
    ],
    "accuracy": "0.015",
    "scope": "Geodesy, engineering survey, topographic mapping.",
    "area": "Hungary.",
    "bbox": {
        "south_latitude": 45.74,
        "west_longitude": 16.11,
        "north_latitude": 48.58,
        "east_longitude": 22.9
    },
    "id": {
        "authority": "EPSG",
        "code": 10668
    },
    "remarks": "Emulation to better than 2mm of the official SGO EHT transformation. ETRF2000 coordinates of the grid nodes were converted to HD72 using the online EHT tool. For cadastral and other legal purposes the official transformation (CT code 10663) must be used."
}

<?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=hgridshift +grids=hu_bme_hd72corr.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=hgridshift +grids=hu_bme_hd72corr.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 ( 10668, 'EPSG', 10668, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=hgridshift +grids=hu_bme_hd72corr.tif +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');