Get results from mysql based on latitude longitude

Question

Get results from mysql based on latitude longitude

I have a mysql Database and 2 tables let's say clients and schools. Now each table has columns latitude and longitude. And I need do make a SELECT for example from second table where schools are in a given radius of one record from first table. Calculations should be made based on latitude and longitude. PS: I am using PHP.

11

php mysql select latitude-longitude

задан parsley72 18 May 2014 в 05:30

1 ответ

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php mysql select latitude-longitude

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score 10 · Accepted Answer

Вы можете вычислить расстояние, используя Сферический закон косинусов:

SELECT DEGREES(ACOS(SIN(RADIANS(clients.latitude)) * SIN(RADIANS(schools.latitude)) + 
                    COS(RADIANS(clients.latitude)) * COS(RADIANS(schools.latitude)) 
                                                   * COS(RADIANS(clients.longitude 
                                                               – schools.longitude)))) 
       * 60 * 1.1515 * 1.609344 AS distance
FROM clients, schools HAVING distance < $radius

RADIANS(X) - градусы в радианы
ACOS(X) - косинус дуги X, то есть величина, косинус которой равен X
DEGREES(X) - радианы в градусы

60 - минуты в градусе
1.1515 - миля в морской миле
1.609344 - километр в миле