Dear list,
I am using the package geoRglm to do some predictive mapping. There is a 
function that calculates the distance between observed data points and the 
prediction locations using a .C call to a function which eventually calculates 
the length of the hypotenuse between one location and the other given the 
vertical and horizontal separation distance of those points.

My question is, is this method of distance-finding incompatible with long-lat 
style coordinates? Should I first transform my data and prediction locations 
into something where the unit of measurement is in metres rather than decimal 
degrees?

Many thanks,

Simon

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