mgrs_to_utm.py

import re
from collections import namedtuple

MGRS = namedtuple('MGRS', ['zone', 'band', 'col', 'row', 'east', 'north'])
UTM = namedtuple('UTM', ['zone', 'band', 'east', 'north'])

def idx(ch):
    idx = ord(ch)-ord('A')
    if ch > 'O': idx -= 1 # skip 'O'
    if ch > 'I': idx -= 1 # skip 'I'
    return idx

def parseMGRS(mgrs_str):   
        fields = re.match(r"(?P<zone>[0-9][0-9]?)(?P<band>[A-Z])(?P<col>[A-Z])(?P<row>[A-Z])", mgrs_str).groupdict()
        return MGRS(int(fields['zone']), idx(fields['band']), idx(fields['col']), idx(fields['row']), 0, 0)

def MGRS2UTM(mgrs): 
        N = ((mgrs.band-idx('N'))*8*111000)//2000000
        north = N*2000000 + mgrs.row*100000 + mgrs.north
        if mgrs.zone%2 == 0:
            north -= idx('F')*100000
        if mgrs.band < idx('N'):
            north += 10000000
        east = 100000*(mgrs.col - ((mgrs.zone-1)*8)%24 + 1) + mgrs.east        
        return UTM(mgrs.zone, mgrs.band, east, north)
        
mgrs = parseMGRS("32TQQ")
print mgrs
utm = MGRS2UTM(mgrs)
print utm