def epsg_from_utm_zone(zone):
    """
    Returns the WGS-84 EPSG for a given UTM zone
    Input:
    zone(int): Zone, positive values for North
    Output:
    epsg code(int).
    """

    if zone > 0:
        epsg = 32600 + zone
    else:
        epsg = 32700 - zone
    return epsg