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POHow to get the nearest places from a Latitude/Longitude in MySQL table?
 

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  1. POHow to get the nearest places from a Latitude/Longitude in MySQL table?
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    <p>I want to make a table of with columns in a MySQL database:</p> <ol> <li>Index</li> <li>Latitude</li> <li>Longitude</li> <li>Places like place of Countries, Cities, People, Building etc.</li> </ol> <p>With huge number of rows, in order of hundred thousands until million of rows.</p> <p><strong>If I want to get nearest places of a selected row in the table, how can I do that in the fastest way?</strong></p> <p>It is no problem if more information, indexing, or presorting are necessary.</p> <p>======<br /> Edit 1:<br /> I have read the answer and the answer is using a formula, for example from the best answer:<br /> (((acos(sin((".$latitude."*pi()/180)) * sin((<code>geo_latitude</code>*pi()/180))+cos((".latitude."*pi()/180)) * cos((<code>geo_latitude</code>*pi()/180)) * cos(((".$longitude."- <code>geo_longitude</code>)*pi()/180))))*180/pi())*60*1.1515*1.609344)<br /></p> <p>If I have 1 million rows, that means, there are 1 million of expensive calculation. I thing it will be very slow.<br /><br /></p> <p>Are the optimization, for example using filtering in the beginning:<br /> 1. If the input is City A in location 10.000, 20.000, then filter cities that located at 9.000 to 11.00.<br /> 2. Calculate with the formula above.<br /></p> <p><strong>How to optimize the speed of that algorithm?</strong><br /></p> <p>====<br /> Edit 2:<br /> Sorry, I've only read the best answer.<br /> I found what I've looked for in the other answer: <a href="http://www.scribd.com/doc/2569355/Geo-Distance-Search-with-MySQL" rel="nofollow">http://www.scribd.com/doc/2569355/Geo-Distance-Search-with-MySQL</a><br /></p>
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    1. USYohanes Nurcahyo
    1. USYohanes Nurcahyo
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      1. POHow to get the nearest places from a Latitude/Longitude in MySQL table?
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      1. VTDownMod
    1. COplenty of these answers on stack overflow, search for it. it's called the Haversine formula.
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      1. POHow to get the nearest places from a Latitude/Longitude in MySQL table?
      1. USRobbie Averill
    2. COhttp://stackoverflow.com/questions/5236921/geo-search-distance-in-php-mysql-performance/5238667#5238667
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      1. POHow to get the nearest places from a Latitude/Longitude in MySQL table?
      1. USMark Baker
 

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