Geodetic CRS: Poolbeg height (ft(Br36))
Datum: Poolbeg
Data source: EPSG
Information source: IOGP
Revision date: 2021-04-20
Scope: Change of height to a different vertical reference surface.
Area of use: United Kingdom (UK) - Northern Ireland (Ulster) - onshore.
Description: (0,)
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: 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: 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]]