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CREATE PROCEDURE geo_zip_dist (IN center_zip int, IN dist int) | |
BEGIN | |
declare center_lon float; declare center_lat float; | |
declare lon1 float; declare lon2 float; | |
declare lat1 float; declare lat2 float; | |
-- Lookup the original lon and lat for the zip | |
select lon, lat into center_lon, center_lat from zips | |
where zip=center_zip; | |
-- calc lat and lon for the rectangle | |
set lon1 = center_lon-dist/ABS(COS(radians(center_lat))*69); | |
set lon2 = center_lon+dist/ABS(COS(radians(center_lat))*69); | |
set lat1 = center_lat-(dist/69); | |
set lat2 = center_lat+(dist/69); | |
-- create temporary table | |
-- DROP TABLE local_zips; | |
CREATE TEMPORARY TABLE IF NOT EXISTS local_zips ( | |
zip int not null, | |
distance double, | |
primary key (zip) | |
); | |
TRUNCATE local_zips; | |
-- run the query and insert into temp table | |
INSERT INTO local_zips | |
SELECT dest.zip, | |
3956 * 2 * ASIN(SQRT( POWER(SIN((orig.lat - dest.lat) * pi()/180 / 2), 2) + | |
COS(orig.lat * pi()/180) * COS(dest.lat * pi()/180) * | |
POWER(SIN((orig.lon -dest.lon) * pi()/180 / 2), 2) )) AS distance | |
FROM zips orig, zips dest | |
WHERE orig.zip=center_zip AND | |
dest.lon between lon1 and lon2 AND | |
dest.lat between lat1 and lat2 | |
having distance < dist | |
ORDER BY distance; |
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