EPSG:6901

Ancienne Triangulation Francaise (Paris)

Attributes

Ellipsoid: Plessis 1817

Prime meridian: Paris RGS

Data source: EPSG

Revision date: 2022-12-12

Scope: Topographic mapping.

Remarks: Uses the RGS value for the Paris meridian. In Alsace, data suspected to be transformation of German network into ATF. Replaced by Nouvelle Triangulation Francaise (Paris) (code 6807) which uses the 1936 IGN value for the Paris meridian.

Area of use: France - mainland onshore.

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WGS84 bounds:
8.23 42.33
-4.87 51.14

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Definition: OGC Well Known Text

DATUM["Ancienne_Triangulation_Francaise_Paris",
    SPHEROID["Plessis 1817",6376523,308.64,
        AUTHORITY["EPSG","7027"]],
    AUTHORITY["EPSG","6901"]],
PRIMEM["Paris RGS",2.33720833333333,
    AUTHORITY["EPSG","8914"]]

Definition: OGC Well Known Text 2 (2019)

DATUM["Ancienne Triangulation Francaise (Paris)",
    ELLIPSOID["Plessis 1817",6376523,308.64,
        LENGTHUNIT["metre",1]],
    ID["EPSG",6901]],
PRIMEM["Paris RGS",2.33720833333333,
    ANGLEUNIT["degree",0.0174532925199433],
    ID["EPSG",8914]]

Definition: ESRI Well Known Text

DATUM["D_ATF",
    SPHEROID["Plessis_1817",6376523.0,308.64]],
PRIMEM["Paris_RGS",2.33720833333333]

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeodeticReferenceFrame",
    "name": "Ancienne Triangulation Francaise (Paris)",
    "ellipsoid": {
        "name": "Plessis 1817",
        "semi_major_axis": 6376523,
        "inverse_flattening": 308.64
    },
    "prime_meridian": {
        "name": "Paris RGS",
        "longitude": 2.33720833333333
    },
    "scope": "Topographic mapping.",
    "area": "France - mainland onshore.",
    "bbox": {
        "south_latitude": 42.33,
        "west_longitude": -4.87,
        "north_latitude": 51.14,
        "east_longitude": 8.23
    },
    "id": {
        "authority": "EPSG",
        "code": 6901
    }
}

Definition: GeoServer

6901-datum=DATUM["Ancienne_Triangulation_Francaise_Paris",SPHEROID["Plessis 1817",6376523,308.64,AUTHORITY["EPSG","7027"]],AUTHORITY["EPSG","6901"]],PRIMEM["Paris RGS",2.33720833333333,AUTHORITY["EPSG","8914"]]