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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'

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    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 Aug 15 '13 at 7:16
  • Data is from New Zealand , and the software is 'VisiCAD' – Hammad Shahid Aug 15 '13 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 Aug 15 '13 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 Aug 15 '13 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 Oct 22 '13 at 20:50
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Try:

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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