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gergelypolonkai-web-jekyll/content/blog/2013-03-05-haversine-in-mys...

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Haversine in MySQL

date

2013-03-05T12:49:28Z

category

blog

tags

mysql,development

url

blog/2013/3/5/haversine-in-mysql.html

save_as

blog/2013/3/5/haversine-in-mysql.html

status

published

author

Gergely Polonkai

Just insert it in your database, feed them two Google coordinates, and you get the distance in kilometres. If you happen to need it in miles, change the constant 12756.200 in the RETURN row to 7922.6 instead.

DELIMITER $$

CREATE FUNCTION `haversine` (lng1 FLOAT, lat1 FLOAT, lng2 FLOAT, lat2 FLOAT)
RETURNS float NO SQL DETERMINISTIC
BEGIN
    SET @a = ABS(POWER(SIN(RADIANS(lat1 - lat2)) / 2, 2) + COS(RADIANS(lat1)) * COS(RADIANS(lat2)) * POWER(SIN(RADIANS(lng1 - lng2)) / 2, 2));
    RETURN 12756.200 * ATAN2(SQRT(@a), SQRT(1 - @a));
END$$