[R] Easting and northing cf. Latitude and longitude

[Patrick Connolly]

I think I've seen this discussed here before but it doesn't seem to
appear in the archive.

I am using the map package which so far has been fine for my purposes.
Some people I work with have GPS type data that defines positions as
number of metres not degrees.  I don't know how much the system
varies, but in New Zealand, they are referred to as Eastings and
Northings.

What I would like to know is how complicated it is to convert between
such data and the normal latitude and longitude that the map package
uses.  I assume various datum points are used for different parts of
the world, and knowing the appropriate one and the definition of a
"northing" and an "easting", the conversion would be relatively
straight forward.

TIA




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Patrick Connolly
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