EPSG:4451

NZVD2009 height to Bluff 1955 height (1)

Attributes

Geodetic CRS: NZVD2009 height

Datum: New Zealand Vertical Datum 2009

Data source: EPSG

Information source: Land Information New Zealand (LINZ) standard S25004.

Revision date: 2011-01-25

Scope: Change of height to a different vertical reference surface.

Remarks: Accuracy 0.05m (1 sigma).

Method: Vertical Offset

Area of use: New Zealand - South Island - Bluff vertical CRS area.

Description: (0,)

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SimpleMap
New Zealand - South Island - Bluff vertical CRS area.

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Definition: OGC Well Known Text 2 (2019)

COORDINATEOPERATION["NZVD2009 height to Bluff 1955 height (1)",
    VERSION["LINZ-NZ BLUF"],
    SOURCECRS[
        VERTCRS["NZVD2009 height",
            VDATUM["New Zealand Vertical Datum 2009"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",4440]]],
    TARGETCRS[
        VERTCRS["Bluff 1955 height",
            VDATUM["Bluff 1955"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5760]]],
    METHOD["Vertical Offset",
        ID["EPSG",9616]],
    PARAMETER["Vertical Offset",0.36,
        LENGTHUNIT["metre",1],
        ID["EPSG",8603]],
    OPERATIONACCURACY[0.05],
    USAGE[
        SCOPE["Change of height to a different vertical reference surface."],
        AREA["New Zealand - South Island - Bluff vertical CRS area."],
        BBOX[-46.71,168.01,-46.26,168.86]],
    ID["EPSG",4451],
    REMARK["Accuracy 0.05m (1 sigma)."]]

Definition: PROJ.4

+proj=geogoffset +dh=0.36

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4451","+proj=geogoffset +dh=0.36");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "NZVD2009 height to Bluff 1955 height (1)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "NZVD2009 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "New Zealand Vertical Datum 2009"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4440
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "Bluff 1955 height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Bluff 1955"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5760
        }
    },
    "method": {
        "name": "Vertical Offset",
        "id": {
            "authority": "EPSG",
            "code": 9616
        }
    },
    "parameters": [
        {
            "name": "Vertical Offset",
            "value": 0.36,
            "unit": "metre",
            "id": {
                "authority": "EPSG",
                "code": 8603
            }
        }
    ],
    "accuracy": "0.05",
    "scope": "Change of height to a different vertical reference surface.",
    "area": "New Zealand - South Island - Bluff vertical CRS area.",
    "bbox": {
        "south_latitude": -46.71,
        "west_longitude": 168.01,
        "north_latitude": -46.26,
        "east_longitude": 168.86
    },
    "id": {
        "authority": "EPSG",
        "code": 4451
    },
    "remarks": "Accuracy 0.05m (1 sigma)."
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=geogoffset"
	"dh=0.36"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=geogoffset +dh=0.36">
	<Layer srs="+proj=geogoffset +dh=0.36">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4451, 'EPSG', 4451, '+proj=geogoffset +dh=0.36', 'None');