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       <curve name="haversine distance [m]" color="#1f77b4"/>
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  <snippet name="haversine distance [m]">
   <global>R = 6378.137 -- Radius of earth in KM</global>
   <function>-- Compute the Haversine distance between 
-- two points defined by latitude and longitude.
-- Return the distance in meters
lat1, lon1 = value, v1
lat2, lon2 = v2, v3
dLat = (lat2 - lat1) * math.pi / 180
dLon = (lon2 - lon1) * math.pi / 180
a = math.sin(dLat/2) * math.sin(dLat/2) +
math.cos(lat1 * math.pi / 180) * math.cos(lat2 * math.pi / 180) *
math.sin(dLon/2) * math.sin(dLon/2)
c = 2 * math.atan(math.sqrt(a), math.sqrt(1-a))
d = R * c
distance = d * 1000 -- meters
return distance</function>
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