EPSG:11817

ETRS89-GRC [HTRS07] to ETRF2000 (2)

Attributes

Geodetic CRS: ETRS89-GRC [HTRS07]

Datum: Hellenic Terrestrial Reference System of 2007

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: IOGP

Revision date: 2026-07-21

Scope: Merging of spatial data referenced to different national realizations of ETRS89 at the sub-decimetre level of accuracy.

Remarks: Derived through concatenation of HTRS07 relationship to ITRF2005 determined in 2007 at EPN station AUT1 in Thessoloniki (tX=-0.384m, tY=0.291m, tZ=0.236m, CT code 11818) with EUREF transformation ITRF2005 to ETRF2000 (CT code 7950). Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Accuracy is exact by definition at the ETRS89-GRC [HTRS07] anchor epoch of 2007.5, but deteriorates with time due to tectonic deformation and/or volcanic eruption. In southern Greece, velocities relative to ETRS89 exceed 3 cm/year, with co-seismic displacements of several cm and up to 40cm.

Method: Time-dependent Position Vector tfm (geocentric)

Area of use: Greece - onshore and offshore. Includes Aegean Islands, Ionian Islands, Dodecanese Islands, Crete, and Mount Athos.

Description: (0,)

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Greece - onshore and offshore. Includes Aegean Islands, Ionian Islands, Dodecanese Islands, Crete, and Mount Athos.

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Definition: OGC Well Known Text 2 (2019)

COORDINATEOPERATION["ETRS89-GRC [HTRS07] to ETRF2000 (2)",
    VERSION["IOGP-Grc 2007"],
    SOURCECRS[
        GEODCRS["ETRS89-GRC [HTRS07]",
            DATUM["Hellenic Terrestrial Reference System of 2007",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]],
                ANCHOREPOCH[2007.5]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[Cartesian,3],
                AXIS["(X)",geocentricX,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["(Y)",geocentricY,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
                AXIS["(Z)",geocentricZ,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",11091]]],
    TARGETCRS[
        GEODCRS["ETRF2000",
            DYNAMIC[
                FRAMEEPOCH[1989]],
            DATUM["European Terrestrial Reference Frame 2000",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[Cartesian,3],
                AXIS["(X)",geocentricX,
                    ORDER[1],
                    LENGTHUNIT["metre",1]],
                AXIS["(Y)",geocentricY,
                    ORDER[2],
                    LENGTHUNIT["metre",1]],
                AXIS["(Z)",geocentricZ,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",7930]]],
    METHOD["Time-dependent Position Vector tfm (geocentric)",
        ID["EPSG",1053]],
    PARAMETER["X-axis translation",-329.9,
        LENGTHUNIT["millimetre",0.001],
        ID["EPSG",8605]],
    PARAMETER["Y-axis translation",341.2,
        LENGTHUNIT["millimetre",0.001],
        ID["EPSG",8606]],
    PARAMETER["Z-axis translation",182.2,
        LENGTHUNIT["millimetre",0.001],
        ID["EPSG",8607]],
    PARAMETER["X-axis rotation",0.891,
        ANGLEUNIT["milliarc-second",4.84813681109536E-09],
        ID["EPSG",8608]],
    PARAMETER["Y-axis rotation",5.39,
        ANGLEUNIT["milliarc-second",4.84813681109536E-09],
        ID["EPSG",8609]],
    PARAMETER["Z-axis rotation",-8.712,
        ANGLEUNIT["milliarc-second",4.84813681109536E-09],
        ID["EPSG",8610]],
    PARAMETER["Scale difference",0.4,
        SCALEUNIT["parts per billion",1E-09],
        ID["EPSG",8611]],
    PARAMETER["Rate of change of X-axis translation",-0.2,
        LENGTHUNIT["millimetres per year",3.16887651727315E-11],
        ID["EPSG",1040]],
    PARAMETER["Rate of change of Y-axis translation",0.1,
        LENGTHUNIT["millimetres per year",3.16887651727315E-11],
        ID["EPSG",1041]],
    PARAMETER["Rate of change of Z-axis translation",-1.8,
        LENGTHUNIT["millimetres per year",3.16887651727315E-11],
        ID["EPSG",1042]],
    PARAMETER["Rate of change of X-axis rotation",0.081,
        ANGLEUNIT["milliarc-seconds per year",1.53631468932076E-16],
        ID["EPSG",1043]],
    PARAMETER["Rate of change of Y-axis rotation",0.49,
        ANGLEUNIT["milliarc-seconds per year",1.53631468932076E-16],
        ID["EPSG",1044]],
    PARAMETER["Rate of change of Z-axis rotation",-0.792,
        ANGLEUNIT["milliarc-seconds per year",1.53631468932076E-16],
        ID["EPSG",1045]],
    PARAMETER["Rate of change of Scale difference",0.08,
        SCALEUNIT["parts per billion per year",3.16887651727315E-17],
        ID["EPSG",1046]],
    PARAMETER["Parameter reference epoch",2000,
        TIMEUNIT["year",31556925.445],
        ID["EPSG",1047]],
    OPERATIONACCURACY[0.8],
    USAGE[
        SCOPE["Merging of spatial data referenced to different national realizations of ETRS89 at the sub-decimetre level of accuracy."],
        AREA["Greece - onshore and offshore. Includes Aegean Islands, Ionian Islands, Dodecanese Islands, Crete, and Mount Athos."],
        BBOX[33.26,18.26,41.75,30.11]],
    ID["EPSG",11817],
    REMARK["Derived through concatenation of HTRS07 relationship to ITRF2005 determined in 2007 at EPN station AUT1 in Thessoloniki (tX=-0.384m, tY=0.291m, tZ=0.236m, CT code 11818) with EUREF transformation ITRF2005 to ETRF2000 (CT code 7950). Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Accuracy is exact by definition at the ETRS89-GRC [HTRS07] anchor epoch of 2007.5, but deteriorates with time due to tectonic deformation and/or volcanic eruption. In southern Greece, velocities relative to ETRS89 exceed 3 cm/year, with co-seismic displacements of several cm and up to 40cm."]]

Definition: PROJ.4

+proj=helmert +x=-0.3299 +y=0.3412 +z=0.1822 +rx=0.000891 +ry=0.00539 +rz=-0.008712 +s=0.0004 +dx=-0.0002 +dy=0.0001 +dz=-0.0018 +drx=8.1e-05 +dry=0.00049 +drz=-0.000792 +ds=8e-05 +t_epoch=2000 +convention=position_vector

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11817","+proj=helmert +x=-0.3299 +y=0.3412 +z=0.1822 +rx=0.000891 +ry=0.00539 +rz=-0.008712 +s=0.0004 +dx=-0.0002 +dy=0.0001 +dz=-0.0018 +drx=8.1e-05 +dry=0.00049 +drz=-0.000792 +ds=8e-05 +t_epoch=2000 +convention=position_vector");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "Transformation",
    "name": "ETRS89-GRC [HTRS07] to ETRF2000 (2)",
    "source_crs": {
        "type": "GeodeticCRS",
        "name": "ETRS89-GRC [HTRS07]",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Hellenic Terrestrial Reference System of 2007",
            "anchor_epoch": 2007.5,
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "Cartesian",
            "axis": [
                {
                    "name": "Geocentric X",
                    "abbreviation": "X",
                    "direction": "geocentricX",
                    "unit": "metre"
                },
                {
                    "name": "Geocentric Y",
                    "abbreviation": "Y",
                    "direction": "geocentricY",
                    "unit": "metre"
                },
                {
                    "name": "Geocentric Z",
                    "abbreviation": "Z",
                    "direction": "geocentricZ",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 11091
        },
        "remarks": "National realization of ETRS89 in Greece."
    },
    "target_crs": {
        "type": "GeodeticCRS",
        "name": "ETRF2000",
        "datum": {
            "type": "DynamicGeodeticReferenceFrame",
            "name": "European Terrestrial Reference Frame 2000",
            "frame_reference_epoch": 1989,
            "ellipsoid": {
                "name": "GRS 1980",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257222101
            }
        },
        "coordinate_system": {
            "subtype": "Cartesian",
            "axis": [
                {
                    "name": "Geocentric X",
                    "abbreviation": "X",
                    "direction": "geocentricX",
                    "unit": "metre"
                },
                {
                    "name": "Geocentric Y",
                    "abbreviation": "Y",
                    "direction": "geocentricY",
                    "unit": "metre"
                },
                {
                    "name": "Geocentric Z",
                    "abbreviation": "Z",
                    "direction": "geocentricZ",
                    "unit": "metre"
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 7930
        },
        "remarks": "Replaces ETRF97 (code 7928). On the publication of ETRF2005 the EUREF Technical Working Group recommended ETRF2000 be the realization of ETRS89. ETRF2014 and ETRF2020 (codes 8401 and 10569) are technically superior to all earlier realizations of ETRS89."
    },
    "method": {
        "name": "Time-dependent Position Vector tfm (geocentric)",
        "id": {
            "authority": "EPSG",
            "code": 1053
        }
    },
    "parameters": [
        {
            "name": "X-axis translation",
            "value": -329.9,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetre",
                "conversion_factor": 0.001
            },
            "id": {
                "authority": "EPSG",
                "code": 8605
            }
        },
        {
            "name": "Y-axis translation",
            "value": 341.2,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetre",
                "conversion_factor": 0.001
            },
            "id": {
                "authority": "EPSG",
                "code": 8606
            }
        },
        {
            "name": "Z-axis translation",
            "value": 182.2,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetre",
                "conversion_factor": 0.001
            },
            "id": {
                "authority": "EPSG",
                "code": 8607
            }
        },
        {
            "name": "X-axis rotation",
            "value": 0.891,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-second",
                "conversion_factor": 4.84813681109536e-09
            },
            "id": {
                "authority": "EPSG",
                "code": 8608
            }
        },
        {
            "name": "Y-axis rotation",
            "value": 5.39,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-second",
                "conversion_factor": 4.84813681109536e-09
            },
            "id": {
                "authority": "EPSG",
                "code": 8609
            }
        },
        {
            "name": "Z-axis rotation",
            "value": -8.712,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-second",
                "conversion_factor": 4.84813681109536e-09
            },
            "id": {
                "authority": "EPSG",
                "code": 8610
            }
        },
        {
            "name": "Scale difference",
            "value": 0.4,
            "unit": {
                "type": "ScaleUnit",
                "name": "parts per billion",
                "conversion_factor": 1e-09
            },
            "id": {
                "authority": "EPSG",
                "code": 8611
            }
        },
        {
            "name": "Rate of change of X-axis translation",
            "value": -0.2,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetres per year",
                "conversion_factor": 3.16887651727315e-11
            },
            "id": {
                "authority": "EPSG",
                "code": 1040
            }
        },
        {
            "name": "Rate of change of Y-axis translation",
            "value": 0.1,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetres per year",
                "conversion_factor": 3.16887651727315e-11
            },
            "id": {
                "authority": "EPSG",
                "code": 1041
            }
        },
        {
            "name": "Rate of change of Z-axis translation",
            "value": -1.8,
            "unit": {
                "type": "LinearUnit",
                "name": "millimetres per year",
                "conversion_factor": 3.16887651727315e-11
            },
            "id": {
                "authority": "EPSG",
                "code": 1042
            }
        },
        {
            "name": "Rate of change of X-axis rotation",
            "value": 0.081,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-seconds per year",
                "conversion_factor": 1.53631468932076e-16
            },
            "id": {
                "authority": "EPSG",
                "code": 1043
            }
        },
        {
            "name": "Rate of change of Y-axis rotation",
            "value": 0.49,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-seconds per year",
                "conversion_factor": 1.53631468932076e-16
            },
            "id": {
                "authority": "EPSG",
                "code": 1044
            }
        },
        {
            "name": "Rate of change of Z-axis rotation",
            "value": -0.792,
            "unit": {
                "type": "AngularUnit",
                "name": "milliarc-seconds per year",
                "conversion_factor": 1.53631468932076e-16
            },
            "id": {
                "authority": "EPSG",
                "code": 1045
            }
        },
        {
            "name": "Rate of change of Scale difference",
            "value": 0.08,
            "unit": {
                "type": "ScaleUnit",
                "name": "parts per billion per year",
                "conversion_factor": 3.16887651727315e-17
            },
            "id": {
                "authority": "EPSG",
                "code": 1046
            }
        },
        {
            "name": "Parameter reference epoch",
            "value": 2000,
            "unit": {
                "type": "TimeUnit",
                "name": "year",
                "conversion_factor": 31556925.445
            },
            "id": {
                "authority": "EPSG",
                "code": 1047
            }
        }
    ],
    "accuracy": "0.8",
    "scope": "Merging of spatial data referenced to different national realizations of ETRS89 at the sub-decimetre level of accuracy.",
    "area": "Greece - onshore and offshore. Includes Aegean Islands, Ionian Islands, Dodecanese Islands, Crete, and Mount Athos.",
    "bbox": {
        "south_latitude": 33.26,
        "west_longitude": 18.26,
        "north_latitude": 41.75,
        "east_longitude": 30.11
    },
    "id": {
        "authority": "EPSG",
        "code": 11817
    },
    "remarks": "Derived through concatenation of HTRS07 relationship to ITRF2005 determined in 2007 at EPN station AUT1 in Thessoloniki (tX=-0.384m, tY=0.291m, tZ=0.236m, CT code 11818) with EUREF transformation ITRF2005 to ETRF2000 (CT code 7950). Scale difference in ppb and scale difference rate in ppb/yr where 1/billion = 1E-9 or nm/m. Accuracy is exact by definition at the ETRS89-GRC [HTRS07] anchor epoch of 2007.5, but deteriorates with time due to tectonic deformation and/or volcanic eruption. In southern Greece, velocities relative to ETRS89 exceed 3 cm/year, with co-seismic displacements of several cm and up to 40cm."
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=helmert"
	"x=-0.3299"
	"y=0.3412"
	"z=0.1822"
	"rx=0.000891"
	"ry=0.00539"
	"rz=-0.008712"
	"s=0.0004"
	"dx=-0.0002"
	"dy=0.0001"
	"dz=-0.0018"
	"drx=8.1e-05"
	"dry=0.00049"
	"drz=-0.000792"
	"ds=8e-05"
	"t_epoch=2000"
	"convention=position_vector"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=helmert +x=-0.3299 +y=0.3412 +z=0.1822 +rx=0.000891 +ry=0.00539 +rz=-0.008712 +s=0.0004 +dx=-0.0002 +dy=0.0001 +dz=-0.0018 +drx=8.1e-05 +dry=0.00049 +drz=-0.000792 +ds=8e-05 +t_epoch=2000 +convention=position_vector">
	<Layer srs="+proj=helmert +x=-0.3299 +y=0.3412 +z=0.1822 +rx=0.000891 +ry=0.00539 +rz=-0.008712 +s=0.0004 +dx=-0.0002 +dy=0.0001 +dz=-0.0018 +drx=8.1e-05 +dry=0.00049 +drz=-0.000792 +ds=8e-05 +t_epoch=2000 +convention=position_vector">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11817, 'EPSG', 11817, '+proj=helmert +x=-0.3299 +y=0.3412 +z=0.1822 +rx=0.000891 +ry=0.00539 +rz=-0.008712 +s=0.0004 +dx=-0.0002 +dy=0.0001 +dz=-0.0018 +drx=8.1e-05 +dry=0.00049 +drz=-0.000792 +ds=8e-05 +t_epoch=2000 +convention=position_vector', 'None');