EPSG:10666

COORDINATEOPERATION["ETRS89-HUN [ETRF2000] to EOMA 1980 height (2)",
    VERSION["BME-Hun geoid14"],
    SOURCECRS[
        GEOGCRS["ETRS89-HUN [ETRF2000]",
            DATUM["ETRS89-HUN [ETRF2000]",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]],
                ANCHOREPOCH[2024]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,3],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["ellipsoidal height (h)",up,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",11162]]],
    TARGETCRS[
        VERTCRS["EOMA 1980 height",
            VDATUM["Baltic 1980"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5787]]],
    METHOD["Geographic3D to GravityRelatedHeight (gtg)",
        ID["EPSG",1123]],
    PARAMETERFILE["Geoid (height correction) model file","hu_bme_geoid2014.tif"],
    OPERATIONACCURACY[0.06],
    USAGE[
        SCOPE["Derivation of gravity-related heights from GNSS observations."],
        AREA["Hungary."],
        BBOX[45.74,16.11,48.58,22.9]],
    ID["EPSG",10666],
    REMARK["Emulation to better than 7mm of the official SGO EHT model (CT code 10661). The geoid height values were obtained from the online EHT service. For reversible alternative to this transformation see ETRS89-HUN [ETRF2000] to ETRS89-HUN [ETRF2000] + EOMA 1980 height (2) (code 10667)."]]

proj4.defs("EPSG:10666","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=hu_bme_geoid2014.tif +multiplier=1 +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": "ETRS89-HUN [ETRF2000] to EOMA 1980 height (2)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "ETRS89-HUN [ETRF2000]",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "ETRS89-HUN [ETRF2000]",
            "anchor_epoch": 2024,
            "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"
                },
                {
                    "name": "Ellipsoidal height",
                    "abbreviation": "h",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 11162
        },
        "remarks": "National realization of ETRS89 in Hungary."
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "EOMA 1980 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Baltic 1980"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5787
        }
    },
    "method": {
        "name": "Geographic3D to GravityRelatedHeight (gtg)",
        "id": {
            "authority": "EPSG",
            "code": 1123
        }
    },
    "parameters": [
        {
            "name": "Geoid (height correction) model file",
            "value": "hu_bme_geoid2014.tif",
            "id": {
                "authority": "EPSG",
                "code": 8666
            }
        }
    ],
    "accuracy": "0.06",
    "scope": "Derivation of gravity-related heights from GNSS observations.",
    "area": "Hungary.",
    "bbox": {
        "south_latitude": 45.74,
        "west_longitude": 16.11,
        "north_latitude": 48.58,
        "east_longitude": 22.9
    },
    "id": {
        "authority": "EPSG",
        "code": 10666
    },
    "remarks": "Emulation to better than 7mm of the official SGO EHT model (CT code 10661). The geoid height values were obtained from the online EHT service. For reversible alternative to this transformation see ETRS89-HUN [ETRF2000] to ETRS89-HUN [ETRF2000] + EOMA 1980 height (2) (code 10667)."
}

<?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 +inv +proj=vgridshift +grids=hu_bme_geoid2014.tif +multiplier=1 +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 +inv +proj=vgridshift +grids=hu_bme_geoid2014.tif +multiplier=1 +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 ( 10666, 'EPSG', 10666, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +inv +proj=vgridshift +grids=hu_bme_geoid2014.tif +multiplier=1 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');