EPSG:7987

KOC CD height to KOC WD depth (ft) (1)

Attributes

Geodetic CRS: KOC CD height

Datum: KOC Construction Datum

Data source: EPSG

Information source: IOGP

Revision date: 2021-04-20

Steps of transformation: 7980 7812 7813

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

Area of use: Kuwait - onshore.

Description: (0,)

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Kuwait - onshore.

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Definition: OGC Well Known Text 2 (2019)

CONCATENATEDOPERATION["KOC CD height to KOC WD depth (ft) (1)",
    VERSION["IOGP-Kwt"],
    SOURCECRS[
        VERTCRS["KOC CD height",
            VDATUM["KOC Construction Datum"],
            CS[vertical,1],
                AXIS["gravity-related height (H)",up,
                    LENGTHUNIT["metre",1]],
            ID["EPSG",5790]]],
    TARGETCRS[
        VERTCRS["KOC WD depth (ft)",
            VDATUM["KOC Well Datum"],
            CS[vertical,1],
                AXIS["depth (D)",down,
                    LENGTHUNIT["foot",0.3048]],
            ID["EPSG",5614]]],
    STEP[
        COORDINATEOPERATION["KOC CD height to KOC WD height (1)",
            VERSION["KOC-Kwt"],
            SOURCECRS[
                VERTCRS["KOC CD height",
                    VDATUM["KOC Construction Datum"],
                    CS[vertical,1],
                        AXIS["gravity-related height (H)",up,
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",5790]]],
            TARGETCRS[
                VERTCRS["KOC WD height",
                    VDATUM["KOC Well Datum"],
                    CS[vertical,1],
                        AXIS["gravity-related height (H)",up,
                            LENGTHUNIT["metre",1]],
                    ID["EPSG",7979]]],
            METHOD["Vertical Offset",
                ID["EPSG",9616]],
            PARAMETER["Vertical Offset",-4.74,
                LENGTHUNIT["metre",1],
                ID["EPSG",8603]],
            OPERATIONACCURACY[0.1],
            ID["EPSG",7980],
            REMARK["The KOC CD vertical reference surface is 4.74m (15.55ft) below KOC WD surface."]]],
    STEP[
        CONVERSION["Height <> Depth Conversion",
            METHOD["Height Depth Reversal",
                ID["EPSG",1068]],
            ID["EPSG",7812]]],
    STEP[
        CONVERSION["Vertical Axis Unit Conversion",
            METHOD["Change of Vertical Unit",
                ID["EPSG",1104]],
            ID["EPSG",7813]]],
    OPERATIONACCURACY[0.1],
    USAGE[
        SCOPE["Change of height to a different vertical reference surface and unit."],
        AREA["Kuwait - onshore."],
        BBOX[28.53,46.54,30.09,48.48]],
    ID["EPSG",7987]]

Definition: PROJ.4

+proj=pipeline +step +proj=geogoffset +dh=-4.74 +step +proj=axisswap +order=1,2,-3 +step +proj=unitconvert +z_in=m +z_out=ft

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:7987","+proj=pipeline +step +proj=geogoffset +dh=-4.74 +step +proj=axisswap +order=1,2,-3 +step +proj=unitconvert +z_in=m +z_out=ft");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ConcatenatedOperation",
    "name": "KOC CD height to KOC WD depth (ft) (1)",
    "source_crs": {
        "type": "VerticalCRS",
        "name": "KOC CD height",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "KOC Construction Datum"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Gravity-related height",
                    "abbreviation": "H",
                    "direction": "up",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5790
        }
    },
    "target_crs": {
        "type": "VerticalCRS",
        "name": "KOC WD depth (ft)",
        "datum": {
            "type": "VerticalReferenceFrame",
            "name": "KOC Well Datum"
        },
        "coordinate_system": {
            "subtype": "vertical",
            "axis": [
                {
                    "name": "Depth",
                    "abbreviation": "D",
                    "direction": "down",
                    "unit": {
                        "type": "LinearUnit",
                        "name": "foot",
                        "conversion_factor": 0.3048
                    }
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 5614
        }
    },
    "steps": [
        {
            "type": "Transformation",
            "name": "KOC CD height to KOC WD height (1)",
            "source_crs": {
                "type": "VerticalCRS",
                "name": "KOC CD height",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "KOC Construction Datum"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Gravity-related height",
                            "abbreviation": "H",
                            "direction": "up",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 5790
                }
            },
            "target_crs": {
                "type": "VerticalCRS",
                "name": "KOC WD height",
                "datum": {
                    "type": "VerticalReferenceFrame",
                    "name": "KOC Well Datum"
                },
                "coordinate_system": {
                    "subtype": "vertical",
                    "axis": [
                        {
                            "name": "Gravity-related height",
                            "abbreviation": "H",
                            "direction": "up",
                            "unit": "metre"
                        }
                    ]
                },
                "id": {
                    "authority": "EPSG",
                    "code": 7979
                }
            },
            "method": {
                "name": "Vertical Offset",
                "id": {
                    "authority": "EPSG",
                    "code": 9616
                }
            },
            "parameters": [
                {
                    "name": "Vertical Offset",
                    "value": -4.74,
                    "unit": "metre",
                    "id": {
                        "authority": "EPSG",
                        "code": 8603
                    }
                }
            ],
            "accuracy": "0.1",
            "id": {
                "authority": "EPSG",
                "code": 7980
            },
            "remarks": "The KOC CD vertical reference surface is 4.74m (15.55ft) below KOC WD surface."
        },
        {
            "type": "Conversion",
            "name": "Height <> Depth Conversion",
            "method": {
                "name": "Height Depth Reversal",
                "id": {
                    "authority": "EPSG",
                    "code": 1068
                }
            },
            "id": {
                "authority": "EPSG",
                "code": 7812
            }
        },
        {
            "type": "Conversion",
            "name": "Vertical Axis Unit Conversion",
            "method": {
                "name": "Change of Vertical Unit",
                "id": {
                    "authority": "EPSG",
                    "code": 1104
                }
            },
            "id": {
                "authority": "EPSG",
                "code": 7813
            }
        }
    ],
    "accuracy": "0.1",
    "scope": "Change of height to a different vertical reference surface and unit.",
    "area": "Kuwait - onshore.",
    "bbox": {
        "south_latitude": 28.53,
        "west_longitude": 46.54,
        "north_latitude": 30.09,
        "east_longitude": 48.48
    },
    "id": {
        "authority": "EPSG",
        "code": 7987
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=pipeline"
	"step"
	"proj=geogoffset"
	"dh=-4.74"
	"step"
	"proj=axisswap"
	"order=1,2,-3"
	"step"
	"proj=unitconvert"
	"z_in=m"
	"z_out=ft"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=pipeline +step +proj=geogoffset +dh=-4.74 +step +proj=axisswap +order=1,2,-3 +step +proj=unitconvert +z_in=m +z_out=ft">
	<Layer srs="+proj=pipeline +step +proj=geogoffset +dh=-4.74 +step +proj=axisswap +order=1,2,-3 +step +proj=unitconvert +z_in=m +z_out=ft">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 7987, 'EPSG', 7987, '+proj=pipeline +step +proj=geogoffset +dh=-4.74 +step +proj=axisswap +order=1,2,-3 +step +proj=unitconvert +z_in=m +z_out=ft', 'None');