CODEWITHSUNDEEP
mysqlgpsrequestlocationcoordinates
jlafforgue
jlafforgue

Reputation: 287

Find proximity distance GPS

I have a mysql table which contain GPS coordinate latitude and longitude.

I would like to make a request to get records near a given position.

I've tried 2 requests and merged the results but it's not correct...

//Req 1 - bigger than my position 
$req1 = mysql_query('SELECT * FROM table WHERE latitude >= 47.6621549 and longitude >= 2.3547128 ORDER BY latitude, longitude');

 //Req 2 - samller than my position 
$req2 = mysql_query('SELECT * FROM table WHERE latitude <= 47.6621549 and longitude <= 2.3547128 ORDER BY latitude, longitude');

Is it possible to make it with a single request ? With this, i would like to retrieve the distance to the given position with gmap distance API, i think it's not a problem...

Thanks for your answer.

Upvotes: 0

Views: 629

Answers (1)

hodl
hodl

Reputation: 1420

try this.

$range = 2;/* 2 mi */   
mysql_query("SELECT t1.*,
    (
        3956 * 2 * 
        ASIN(
            SQRT(
                POWER(SIN(($lat - t1.latitude) * pi()/180 / 2), 2) 
                + COS($lat * pi()/180) * COS(t1.latitude * pi()/180) 
                * POWER(SIN(($lng - t1.longitude) * pi()/180 / 2), 2)
            )
        )
    ) AS distance 
    FROM table
    HAVING distance < $range
    ORDER BY distance ASC");

Upvotes: 2

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