> I was wondering if anyone had an IDL routine available to take latitude and
> longitude co-ordinates and convert them to UK Ordnance Survey Eastings and
> Northings? I have found some C code to do the conversion but was hoping to
> avoid using CALL_EXTERNAL if I possibly can! I have searched for a suitable
> IDL library or user-written routine but with no success.
I have written some code for converting from Lat/lon to UTM False
Eastings/Northings for NAD27 and WGS84 (NAD83) map datums. You welcome to
have them if useful to you. In any event, you should get your hands on this
reference: Snyder, J.P., "MapProjections Used by the U.S. Geological Survey",
2nd ed., Geol. Survey Bulletin 1532, 313pp, U.S. Government Printing Office,
Washington, DC, 1982. It has detailed explanantions of mapping datums and
conversion methods. I don't recall if it has info on mapping systems used
outside of North America.
Bigelow Laboratory for Ocean Science
Pemaquid River Company