convert_long_2_utm()
was deprecated in favor of get_utm_zone()
as the
new funciton name more accurately reflects what the function does.
convert_long_to_utm()
take a longitude coordinate and returns the
corresponding UTM zone.
convert_long_to_utm(lon)
The function returns a numeric UTM zone (between 1 and 60).
Input a longitude (decimal degree) coordinate and this simple function returns the number of the UTM zone where that point falls.