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esbanarango/distance_calculation.sql

Created November 16, 2012 10:52
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MySQL calculate distance between two latitude/longitude coordinates, assuming radius of 6,371 km
Raw
distance_calculation.sql
CREATE FUNCTION `lat_lng_distance` (lat1 FLOAT, lng1 FLOAT, lat2 FLOAT, lng2 FLOAT)
RETURNS FLOAT
DETERMINISTIC
BEGIN
RETURN 6371 * 2 * ASIN(SQRT(
POWER(SIN((lat1 - abs(lat2)) * pi()/180 / 2),
2) + COS(lat1 * pi()/180 ) * COS(abs(lat2) *
pi()/180) * POWER(SIN((lng1 - lng2) *
pi()/180 / 2), 2) ));
END
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