in reply to convert from latitude and longitude to x-coord and y-coord

Better than coding up an algorithm again, useGeo::Coordinates::UTM!

Update: Changed reference to the more specific module which is probably what the OP is after, and also as the author of Geo::Coordinates tells us not to use his module (which is only a base class anyway).

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I'd like to be able to assign to an luser

In Section Seekers of Perl Wisdom