import math


def get_distance_metres(aLocation1, aLocation2):

    """
    Returns the ground distance in metres between two LocationGlobal objects
    :param aLocation1: starting location
    :param aLocation2: ending location
    :return:
    """

    dlat = aLocation2.lat - aLocation1.lat
    dlong = aLocation2.lon - aLocation1.lon
    dlong_c = dlong*math.cos(math.radians(aLocation1.lat))
    return math.sqrt((dlat * dlat) + (dlong_c * dlong_c)) * 1.113195e5