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I'm having issues identifying the GPS system they used on this website : https://www.data.gouv.fr/fr/datasets/itineraires-de-randonnee-dans-openstreetmap/

Data looks like this :

804572.9409005984 6112380.026752339

Some data also has negatives like this :

-178481.5674790051 5360282.4944811445

The city it's supposed to aim close to is : Soultzbach les Bains and it's GPS coordinates are :

48.03657232207706, 7.2014655322229375

The closest to it I've been able to get is with Lambert 3 sud but it's still not accurate. I've used this website : https://tool-online.com/conversion-coordonnees.php

Which system is this?

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If you download the Shapefile dataset and open the .prj file, you'll see :

PROJCS["WGS 84 / Pseudo-Mercator",
...
, AUTHORITY["EPSG","3857"]]

This is the WGS 84 / Pseudo-Mercator -- Spherical Mercator, Google Maps, OpenStreetMap, Bing, ArcGIS, ESRI

See here : https://epsg.io/3857

An other indication was on the WMS / WFS layer, if you go on the help page :

enter image description here

And talking about your coordinates, 804572.9409005984 6112380.026752339 are indeed near Soultzbach-les-Bains in the North-East, and -178481.5674790051 5360282.4944811445 near Saint-Ignace in the South-West.

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    Thank you!I figured the answer with the JSON format file which gave the correct EPSG
    – Marc
    Jun 26 at 18:44

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