EPSG:4690

Tahiti 79

Available transformations
to EPSG:4687
EPSG:4687 - RGPF

Selected transformation

Name: Tahiti 79 to RGPF (2)

Method: NTv2

Grid Files: gr3dpf25.gsb

Remarks: Accuracy better than 7cm in coastal urban areas including Papette, and 35cm in interior areas.

Information source: Technical Report "Assistance, conseil et contrôle pour la mise en référence RGPF du cadastre de Tahiti", IGN FI on behalf of Gouvernement de la Polynésie Française, Land Affairs Department (DAF), 18th December 2025.

Revision date: 2026-05-19

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Tahiti 79

Datum: Tahiti 79

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: Gouvernement de la Polynésie Française, Service de l'Urbanisme, Section topographie.

Revision date: 2005-08-12

Scope: Hydrography, topographic mapping.

Remarks: Replaces Tahiti 52 (CRS code 4628) in Tahiti. Replaced by RGPF (CRS code 4687).

Area of use: French Polynesia - Society Islands - Tahiti.

Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree

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SimpleMap

Center coordinates
inf inf

WGS84 bounds:
-149.7 -17.93
-149.09 -17.44

French Polynesia - Society Islands - Tahiti.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        GEOGCRS["Tahiti 79",
            DATUM["Tahiti 79",
                ELLIPSOID["International 1924",6378388,297,
                    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]],
            USAGE[
                SCOPE["Hydrography, topographic mapping."],
                AREA["French Polynesia - Society Islands - Tahiti."],
                BBOX[-17.93,-149.7,-17.44,-149.09]],
            ID["EPSG",4690],
            REMARK["Replaces Tahiti 52 (CRS code 4628) in Tahiti. Replaced by RGPF (CRS code 4687)."]]],
    TARGETCRS[
        GEOGCRS["RGPF",
            DATUM["Reseau Geodesique de la Polynesie Francaise",
                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]],
            USAGE[
                SCOPE["Horizontal component of 3D system."],
                AREA["French Polynesia - onshore and offshore. Includes Society archipelago, Tuamotu archipelago, Marquesas Islands, Gambier Islands and Austral Islands."],
                BBOX[-31.24,-158.13,-4.52,-131.97]],
            ID["EPSG",4687],
            REMARK["Replaces Tahaa 54 (CRS code 4629), IGN 63 Hiva Oa (4689), IGN 72 Nuku Hiva (4630), Maupiti 83 (4692), MHEFO 55 (4688), Moorea 87 (4691) and Tahiti 79 (4690)."]]],
    ABRIDGEDTRANSFORMATION["Tahiti 79 to RGPF (2)",
        METHOD["NTv2",
            ID["EPSG",9615]],
        PARAMETERFILE["Latitude and longitude difference file","gr3dpf25.gsb"],
        USAGE[
            SCOPE["Cadastre, topographic mapping (large scale)."],
            AREA["French Polynesia - Society Islands - Tahiti."],
            BBOX[-17.93,-149.7,-17.44,-149.09]],
        ID["EPSG",11433],
        REMARK["Accuracy better than 7cm in coastal urban areas including Papette, and 35cm in interior areas."]]]

Definition: PROJ.4

+proj=longlat +ellps=intl +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4690","+proj=longlat +ellps=intl +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "Tahiti 79",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Tahiti 79",
            "ellipsoid": {
                "name": "International 1924",
                "semi_major_axis": 6378388,
                "inverse_flattening": 297
            }
        },
        "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": 4690
        },
        "remarks": "Replaces Tahiti 52 (CRS code 4628) in Tahiti. Replaced by RGPF (CRS code 4687)."
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "RGPF",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Reseau Geodesique de la Polynesie Francaise",
            "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": 4687
        },
        "remarks": "Replaces Tahaa 54 (CRS code 4629), IGN 63 Hiva Oa (4689), IGN 72 Nuku Hiva (4630), Maupiti 83 (4692), MHEFO 55 (4688), Moorea 87 (4691) and Tahiti 79 (4690)."
    },
    "transformation": {
        "name": "Tahiti 79 to RGPF (2)",
        "method": {
            "name": "NTv2",
            "id": {
                "authority": "EPSG",
                "code": 9615
            }
        },
        "parameters": [
            {
                "name": "Latitude and longitude difference file",
                "value": "gr3dpf25.gsb",
                "id": {
                    "authority": "EPSG",
                    "code": 8656
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 11433
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=intl"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=intl +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=intl +no_defs +type=crs">
	</Layer>
</Map>