GPS query

gistfile1.txt

SELECT DISTINCT es.county_id, latitude , longitude,
                    IFNULL(tr_county_name.value,co.name) AS countyName,
                    es.name, co.name, co.code
                    FROM hi_establishments as es
                    LEFT JOIN hi_counties as co ON co.id = es.county_id
                    LEFT JOIN hi_translations AS tr_county_name ON tr_county_name.hi_table = 'hi_counties'
                                          AND tr_county_name.lang = 'pt'
                                          AND tr_county_name.field = 'name'
                                          AND tr_county_name.row_id = co.id
                    WHERE valence_id = {$valenceID}
                    GROUP BY countyName 
                    HAVING (
                          3959 * ACOS(
                           COS(
                                RADIANS(
                                    {$userCoordinates["latitude"]})) * COS(RADIANS(latitude)) *
                                    COS(RADIANS(longitude) - RADIANS({$userCoordinates["longitude"]})
                                    )
                           + SIN(RADIANS({$userCoordinates["latitude"]}))
                           * SIN(RADIANS(latitude)))) < 50