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Old 2nd Dec 2009, 12:51
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tanimbar
 
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Worldwide gold standard = NGA GEOTRANS
The US National Geospatial-Intelligence Agency (NGA) probably produces the world-wide gold standard for coordinate transformations. Software - GEOTRANS 2.4.2 available here -

http://earth-info.nga.mil/GandG/geotrans/index.html

Probably best not to rely on transformation software from someone who dabbles with coordinate software - you may find yourself somewhere you don't want to be!

Also, if you are converting ellipsoidal GPS coords into geodetic lat/longs be aware that some software does not work properly and may have errors of 100meters plus.

Good luck, Tanimbar
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