utm
Bidirectional UTM-WGS84 converter for JavaScript.
Translated directly from Tobias Bieniek's implementation in Python.
Usage
var utm = utm.toLatLon(easting, northing, zoneNum, zoneLetter, northern)
Convert from UTM-WGS84 to latitude/longitude coordinates. One and only one of
zoneLetter and northern must be specified.
Returns { latitude, longitude }.
utm.fromLatLon(latitude, longitude[, zoneNum])
Convert from latitude/longitude coordinates to UTM-WGS84. zoneNum can be set
to force a specific zone number.
Returns { easting, northing, zoneNum, zoneLetter }.