EPSG:7967

Poolbeg height (ft(Br36)) to Belfast height (1)

Attributes

Geodetic CRS: Poolbeg height (ft(Br36))

Datum: Poolbeg

Data source: EPSG

Information source: IOGP

Revision date: 2021-04-20

Steps of transformation: 7813 7966

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

Area of use: United Kingdom (UK) - Northern Ireland (Ulster) - onshore.

Description: (0,)

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Definition: PROJ.4

+proj=pipeline +step +proj=affine +s33=0.3048007491 +step +proj=geogoffset +dh=-2.7

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:7967","+proj=pipeline +step +proj=affine +s33=0.3048007491 +step +proj=geogoffset +dh=-2.7");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.4/projjson.schema.json",
    "type": "ConcatenatedOperation",
    "name": "Poolbeg height (ft(Br36)) to Belfast height (1)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "Poolbeg height (ft(Br36))",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Poolbeg"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": {
                        "type": "LinearUnit",
                        "name": "British foot (1936)",
                        "conversion_factor": 0.3048007491
                    }
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5754
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "Belfast height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "Belfast Lough"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5732
        }
    },
    "steps": [
        {
            "type": "Conversion",
            "name": "Vertical Axis Unit Conversion",
            "method": {
                "name": "Change of Vertical Unit",
                "id": {
                    "authority": "EPSG",
                    "code": 1104
                }
            },
            "id": {
                "authority": "EPSG",
                "code": 7813
            }
        },
        {
            "type": "Transformation",
            "name": "Poolbeg height (m) to Belfast height (1)",
            "source_crs": {
                "type": "VerticalCRS",
                "name": "Poolbeg height (m)",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "Poolbeg"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Gravity-related height",
                            "abbreviation": "H",
                            "direction": "up",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 7962
                }
            },
            "target_crs": {
                "type": "VerticalCRS",
                "name": "Belfast height",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "Belfast Lough"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Gravity-related height",
                            "abbreviation": "H",
                            "direction": "up",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 5732
                }
            },
            "method": {
                "name": "Vertical Offset",
                "id": {
                    "authority": "EPSG",
                    "code": 9616
                }
            },
            "parameters": [
                {
                    "name": "Vertical Offset",
                    "value": -2.7,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8603
                    }
                }
            ],
            "accuracy": "0.1",
            "id": {
                "authority": "EPSG",
                "code": 7966
            },
            "remarks": "Poolbeg vertical reference surface is 2.7m below Belfast surface. Nominal accuracy 0.1m but transformations are subject to localised anomalies."
        }
    ],
    "scope": "Change of height to a different vertical reference surface.",
    "area": "United Kingdom (UK) - Northern Ireland (Ulster) - onshore.",
    "bbox": {
        "south_latitude": 53.96,
        "west_longitude": -8.18,
        "north_latitude": 55.36,
        "east_longitude": -5.34
    },
    "id": {
        "authority": "EPSG",
        "code": 7967
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=pipeline"
	"step"
	"proj=affine"
	"s33=0.3048007491"
	"step"
	"proj=geogoffset"
	"dh=-2.7"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=pipeline +step +proj=affine +s33=0.3048007491 +step +proj=geogoffset +dh=-2.7">
	<Layer srs="+proj=pipeline +step +proj=affine +s33=0.3048007491 +step +proj=geogoffset +dh=-2.7">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 7967, 'EPSG', 7967, '+proj=pipeline +step +proj=affine +s33=0.3048007491 +step +proj=geogoffset +dh=-2.7', 'None');

Definition: OGC WKT 2 (2019)

CONCATENATEDOPERATION["Poolbeg height (ft(Br36)) to Belfast height (1)",VERSION["1"],SOURCECRS[VERTCRS["Poolbeg height (ft(Br36))",VDATUM["Poolbeg"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["British foot (1936)",0.3048007491]],ID["EPSG",5754]]],TARGETCRS[VERTCRS["Belfast height",VDATUM["Belfast Lough"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],ID["EPSG",5732]]],STEP[CONVERSION["Vertical Axis Unit Conversion",METHOD["Change of Vertical Unit",ID["EPSG",1104]],ID["EPSG",7813]]],STEP[COORDINATEOPERATION["Poolbeg height (m) to Belfast height (1)",VERSION["OSI-Ire"],SOURCECRS[VERTCRS["Poolbeg height (m)",VDATUM["Poolbeg"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],ID["EPSG",7962]]],TARGETCRS[VERTCRS["Belfast height",VDATUM["Belfast Lough"],CS[vertical,1],AXIS["gravity-related height (H)",up,LENGTHUNIT["metre",1]],ID["EPSG",5732]]],METHOD["Vertical Offset",ID["EPSG",9616]],PARAMETER["Vertical Offset",-2.7,LENGTHUNIT["metre",1],ID["EPSG",8603]],OPERATIONACCURACY[0.1],ID["EPSG",7966],REMARK["Poolbeg vertical reference surface is 2.7m below Belfast surface. Nominal accuracy 0.1m but transformations are subject to localised anomalies."]]],USAGE[SCOPE["Change of height to a different vertical reference surface."],AREA["United Kingdom (UK) - Northern Ireland (Ulster) - onshore."],BBOX[53.96,-8.18,55.36,-5.34]],ID["EPSG",7967]]