EPSG:1891

Greek to GGRS87 (1)

Attributes

Geodetic CRS: Greek

Datum: Greek

Ellipsoid: Bessel 1841

Prime meridian: Greenwich

Data source: EPSG

Information source: Hellenic Petroleum

Revision date: 2011-07-20

Scope: Transformation of coordinates at 5m level of accuracy.

Remarks: More accurate polynomial transformations between Greek / Hatt projection zones and GGRS87 / Greek Grid are available from the Military Geographic Service.

Method: Geographic2D offsets

Area of use: Greece - onshore.

Description: (0,)

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Greece - onshore.

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Definition: OGC Well Known Text 2 (2019)

COORDINATEOPERATION["Greek to GGRS87 (1)",
    VERSION["HGS-Grc"],
    SOURCECRS[
        GEOGCRS["Greek",
            DATUM["Greek",
                ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4120]]],
    TARGETCRS[
        GEOGCRS["GGRS87",
            DATUM["Greek Geodetic Reference System 1987",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4121]]],
    METHOD["Geographic2D offsets",
        ID["EPSG",9619]],
    PARAMETER["Latitude offset",-5.86,
        ANGLEUNIT["arc-second",4.84813681109536E-06],
        ID["EPSG",8601]],
    PARAMETER["Longitude offset",0.28,
        ANGLEUNIT["arc-second",4.84813681109536E-06],
        ID["EPSG",8602]],
    OPERATIONACCURACY[5.0],
    USAGE[
        SCOPE["Transformation of coordinates at 5m level of accuracy."],
        AREA["Greece - onshore."],
        BBOX[34.88,19.57,41.75,28.3]],
    ID["EPSG",1891],
    REMARK["More accurate polynomial transformations between Greek / Hatt projection zones and GGRS87 / Greek Grid are available from the Military Geographic Service."]]

Definition: PROJ.4

+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=geogoffset +dlat=-5.86 +dlon=0.28 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:1891","+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=geogoffset +dlat=-5.86 +dlon=0.28 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "Greek to GGRS87 (1)",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "Greek",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Greek",
            "ellipsoid": {
                "name": "Bessel 1841",
                "semi_major_axis": 6377397.155,
                "inverse_flattening": 299.1528128
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4120
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "GGRS87",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Greek Geodetic Reference System 1987",
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "ellipsoidal",
            "axis": [
                {
                    "name": "Geodetic latitude",
                    "abbreviation": "Lat",
                    "direction": "north",
                    "unit": "degree"
                },
                {
                    "name": "Geodetic longitude",
                    "abbreviation": "Lon",
                    "direction": "east",
                    "unit": "degree"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 4121
        }
    },
    "method": {
        "name": "Geographic2D offsets",
        "id": {
            "authority": "EPSG",
            "code": 9619
        }
    },
    "parameters": [
        {
            "name": "Latitude offset",
            "value": -5.86,
            "unit": {
                "type": "AngularUnit",
                "name": "arc-second",
                "conversion_factor": 4.84813681109536e-06
            },
            "id": {
                "authority": "EPSG",
                "code": 8601
            }
        },
        {
            "name": "Longitude offset",
            "value": 0.28,
            "unit": {
                "type": "AngularUnit",
                "name": "arc-second",
                "conversion_factor": 4.84813681109536e-06
            },
            "id": {
                "authority": "EPSG",
                "code": 8602
            }
        }
    ],
    "accuracy": "5.0",
    "scope": "Transformation of coordinates at 5m level of accuracy.",
    "area": "Greece - onshore.",
    "bbox": {
        "south_latitude": 34.88,
        "west_longitude": 19.57,
        "north_latitude": 41.75,
        "east_longitude": 28.3
    },
    "id": {
        "authority": "EPSG",
        "code": 1891
    },
    "remarks": "More accurate polynomial transformations between Greek / Hatt projection zones and GGRS87 / Greek Grid are available from the Military Geographic Service."
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=pipeline"
	"step"
	"proj=axisswap"
	"order=2,1"
	"step"
	"proj=unitconvert"
	"xy_in=deg"
	"xy_out=rad"
	"step"
	"proj=geogoffset"
	"dlat=-5.86"
	"dlon=0.28"
	"step"
	"proj=unitconvert"
	"xy_in=rad"
	"xy_out=deg"
	"step"
	"proj=axisswap"
	"order=2,1"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=geogoffset +dlat=-5.86 +dlon=0.28 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1">
	<Layer srs="+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=geogoffset +dlat=-5.86 +dlon=0.28 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 1891, 'EPSG', 1891, '+proj=pipeline +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=geogoffset +dlat=-5.86 +dlon=0.28 +step +proj=unitconvert +xy_in=rad +xy_out=deg +step +proj=axisswap +order=2,1', 'None');