EPSG:5425

COORDINATEOPERATION["NAP height to EVRF2000 height (1)",
    VERSION["EuG-Nld"],
    SOURCECRS[
        VERTCRS["NAP height",
            VDATUM["Normaal Amsterdams Peil"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5709]]],
    TARGETCRS[
        VERTCRS["EVRF2000 height",
            VDATUM["European Vertical Reference Frame 2000"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5730]]],
    METHOD["Vertical Offset",
        ID["EPSG",9616]],
    PARAMETER["Vertical Offset",-0.005,
        LENGTHUNIT["metre",1],
        ID["EPSG",8603]],
    OPERATIONACCURACY[0.1],
    USAGE[
        SCOPE["Change of height to a different vertical reference surface."],
        AREA["Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone."],
        BBOX[50.75,3.2,53.7,7.22]],
    ID["EPSG",5425],
    REMARK["Determined at 757 points. RMS residual 0.002m, maximum residual 0.021m. The NAP vertical reference surface is below the EVRF2000 vertical reference surface."]]

proj4.defs("EPSG:5425","+proj=geogoffset +dh=-0.005");

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "NAP height to EVRF2000 height (1)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "NAP height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Normaal Amsterdams Peil"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5709
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "EVRF2000 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "European Vertical Reference Frame 2000"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5730
        }
    },
    "method": {
        "name": "Vertical Offset",
        "id": {
            "authority": "EPSG",
            "code": 9616
        }
    },
    "parameters": [
        {
            "name": "Vertical Offset",
            "value": -0.005,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8603
            }
        }
    ],
    "accuracy": "0.1",
    "scope": "Change of height to a different vertical reference surface.",
    "area": "Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone.",
    "bbox": {
        "south_latitude": 50.75,
        "west_longitude": 3.2,
        "north_latitude": 53.7,
        "east_longitude": 7.22
    },
    "id": {
        "authority": "EPSG",
        "code": 5425
    },
    "remarks": "Determined at 757 points. RMS residual 0.002m, maximum residual 0.021m. The NAP vertical reference surface is below the EVRF2000 vertical reference surface."
}

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=geogoffset +dh=-0.005">
	<Layer srs="+proj=geogoffset +dh=-0.005">
	</Layer>
</Map>

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 5425, 'EPSG', 5425, '+proj=geogoffset +dh=-0.005', 'None');