I am working on a software which returns GPS coordinates in this format:

Lat : '48684499' Lon : '5203474'

I can not understand what type of coordinates are these and not able to convert them into proper Latitude and Longitude like :

Lat : '-41.295929' Long : '174.77573'

  • 1
    Those coordinates look like they are in a Projected Coordinate System with units of metres or feet. To identify which of many thousands of such coordinate systems it may come from can you tell us what part of the world the data comes from and what GIS software you are using?
    – PolyGeo
    Commented Aug 15, 2013 at 7:16
  • Data is from New Zealand , and the software is 'VisiCAD' Commented Aug 15, 2013 at 7:17
  • I'd guess it was UTM Zone 48 South, but that's somewhere in indonesia, according to commons.wikimedia.org/wiki/File:Utm-zones.jpg
    – til_b
    Commented Aug 15, 2013 at 8:25
  • For New Zealand, have a look at linz.govt.nz/geodetic/find-out/using-maps-with-projections. But I could not find any projection to match your first coordinates.
    – AndreJ
    Commented Aug 15, 2013 at 15:42
  • Is it possible we can get some more sample points, and where you expect them to turn up? Failing that, have you asked the OEM for the software for how points are supposed to be translated?
    – BradHards
    Commented Oct 22, 2013 at 20:50

1 Answer 1



PROJ: https://trac.osgeo.org/proj/, http://proj.maptools.org/faq.html

Or the online tool: http://cs2cs.mygeodata.eu/

Hope this helps,

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