#a function that calculates straight line distance in meters between two points given latlng coordinates
def haversine_distance(latlng1, latlng2):
    import math
    lat1 = float(latlng1[0])
    lng1 = float(latlng1[1])
    lat2 = latlng2[0]
    lng2 = latlng2[1]

    p = math.pi/180
    A = 0.5 - math.cos((lat2-lat1) * p)/2 + math.cos(lat1 * p) * math.cos(lat2 * p) * (1-math.cos((lng2- lng1) * p))/2
    distance = 12742 * math.asin((math.sqrt(A))) *1000 #in meter
    return round(distance,2)