EPSG:27500 ATF (Paris) / Nord de Guerre
Projected system (Lambert Conic Conformal (1SP)) in use: France - Alsace. The full definition below, and conversion in one click.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:27500 |
|---|---|
| Name | ATF (Paris) / Nord de Guerre |
| Type | Projected system — Lambert Conic Conformal (1SP) |
| Area of use | France - Alsace |
| Bounds | W 6,84° · S 47,42° · E 8,23° · N 49,07° |
| Countries | France |
| Datum | Ancienne Triangulation Francaise (Paris) |
| Ellipsoid | Plessis 1817 a = 6376523 m · 1/f = 308.64 |
| Prime meridian | Paris RGS 2.3372083333333333 degree |
| Base geographic system | EPSG:4901 — ATF (Paris) |
| Unit | metre (X east, Y north) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Engineering survey, topographic mapping. |
Projection parameters
| Parameter | Value | Unit |
|---|---|---|
| Latitude of natural origin | 55 | grad |
| Longitude of natural origin | 6 | grad |
| Scale factor at natural origin | 0.99950908 | unity |
| False easting | 500000 | metre |
| False northing | 300000 | metre |
proj4 definition
+proj=lcc +lat_1=49.5 +lat_0=49.5 +lon_0=5.4 +k_0=0.99950908 +x_0=500000 +y_0=300000 +a=6376523 +rf=308.64 +pm=2.33720833333333 +units=m +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:27500.
WKT (ESRI format, the .prj content)
PROJCS["Nord_de_Guerre",GEOGCS["GCS_ATF_Paris",DATUM["D_ATF",SPHEROID["Plessis_1817",6376523.0,308.64]],PRIMEM["Paris_RGS",2.33720833333333],UNIT["Grad",0.0157079632679489]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",300000.0],PARAMETER["Central_Meridian",6.0],PARAMETER["Standard_Parallel_1",55.0],PARAMETER["Scale_Factor",0.99950908],PARAMETER["Latitude_Of_Origin",55.0],UNIT["Meter",1.0]]Other systems — France
- EPSG:9830RGF93 v2 / CC50
- EPSG:9842RGF93 v2b / CC42
- EPSG:9843RGF93 v2b / CC43
- EPSG:9844RGF93 v2b / CC44
- EPSG:9845RGF93 v2b / CC45
- EPSG:9846RGF93 v2b / CC46
- EPSG:9847RGF93 v2b / CC47
- EPSG:9848RGF93 v2b / CC48
- EPSG:9849RGF93 v2b / CC49
- EPSG:9850RGF93 v2b / CC50
- EPSG:27561NTF (Paris) / Lambert Nord France
- EPSG:27562NTF (Paris) / Lambert Centre France
- EPSG:27563NTF (Paris) / Lambert Sud France
- EPSG:27564NTF (Paris) / Lambert Corse
- EPSG:27571NTF (Paris) / Lambert zone I
- EPSG:27572NTF (Paris) / Lambert zone II
- EPSG:27573NTF (Paris) / Lambert zone III
- EPSG:27574NTF (Paris) / Lambert zone IV
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.