EPSG:9888

COORDINATEOPERATION["NTF to RGF93 v2 (1)",
    VERSION["IGN-Fra 1m"],
    SOURCECRS[
        GEOGCRS["NTF",
            DATUM["Nouvelle Triangulation Francaise",
                ELLIPSOID["Clarke 1880 (IGN)",6378249.2,293.466021293627,
                    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",4275]]],
    TARGETCRS[
        GEOGCRS["RGF93 v2",
            DATUM["Reseau Geodesique Francais 1993 v2",
                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",9777]]],
    METHOD["Geocentric translation by Grid Interpolation (IGN)",
        ID["EPSG",1087]],
    PARAMETERFILE["Geocentric translation file","gr3df97a.txt"],
    INTERPOLATIONCRS[
        GEOGCRS["RGF93 v2",
            DATUM["Reseau Geodesique Francais 1993 v2",
                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]]]],
    OPERATIONACCURACY[1.0],
    USAGE[
        SCOPE["Transformation of coordinates at 1m level of accuracy."],
        AREA["France - onshore - mainland and Corsica."],
        BBOX[41.31,-4.87,51.14,9.63]],
    ID["EPSG",9888],
    REMARK["Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2 within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9890."]]

proj4.defs("EPSG:9888","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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": "NTF to RGF93 v2 (1)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "NTF",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Nouvelle Triangulation Francaise",
            "ellipsoid": {
                "name": "Clarke 1880 (IGN)",
                "semi_major_axis": 6378249.2,
                "semi_minor_axis": 6356515
            }
        },
        "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": 4275
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "RGF93 v2",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Reseau Geodesique Francais 1993 v2",
            "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": 9777
        }
    },
    "interpolation_crs": {
        "type": "GeographicCRS",
        "name": "RGF93 v2",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Reseau Geodesique Francais 1993 v2",
            "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": 9777
        }
    },
    "method": {
        "name": "Geocentric translation by Grid Interpolation (IGN)",
        "id": {
            "authority": "EPSG",
            "code": 1087
        }
    },
    "parameters": [
        {
            "name": "Geocentric translation file",
            "value": "gr3df97a.txt",
            "id": {
                "authority": "EPSG",
                "code": 8727
            }
        }
    ],
    "accuracy": "1.0",
    "scope": "Transformation of coordinates at 1m level of accuracy.",
    "area": "France - onshore - mainland and Corsica.",
    "bbox": {
        "south_latitude": 41.31,
        "west_longitude": -4.87,
        "north_latitude": 51.14,
        "east_longitude": 9.63
    },
    "id": {
        "authority": "EPSG",
        "code": 9888
    },
    "remarks": "Parameter file is from NTF to RGF93 v1 (code 9327), assuming that RGF93 v1 is equivalent to RGF93 v2 within the accuracy of the transformation. May be emulated using NTv2 method - see CT code 9890."
}

<?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=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +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 ( 9888, 'EPSG', 9888, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=push +v_3 +step +proj=cart +ellps=clrk80ign +step +proj=xyzgridshift +grids=fr_ign_gr3df97a.tif +grid_ref=output_crs +ellps=GRS80 +step +inv +proj=cart +ellps=GRS80 +step +proj=pop +v_3 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');