I've got a CSV file which I downloaded from a Waka Kotahi open data website.
The file has got X,Y coordinates of locations. I am using that file in Python to generate markers in Folium. I don't have ArcGIS or QGIS.
Coordinates that file contains does not look in EPSG:4326 format. I suspect that it could be NZTM coordinate system (i.e. EPSG:2193). Because value looks like (X=1406914, y= 4915023).
Is there anyway that I could find the coordinate system of coordinates without using GIS system?