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Check out their new search http://search.imagine-live.com/. I am quite sure it is a test page but still quite interesting. You will notice the map at the right hand side when you try to find something. This is what is hitting the iplocatethis.com service.
There is also quite a lot going on in the search engine world and a few similar projects from other search engines.

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Google’s http://www.searchmash.com/
Yahoo’s http://au.alpha.yahoo.com/
Ask.com’s http://www.ask.com/?ax=5

I have put together a Zip file that can be downloaded and easily installed that contains all the drivers, software and updates that can be installed in order to get the brightness working on your Sony Vaio laptop with Microsoft Windows Vista installed.

Grab the file here (16MB).
Let me know which laptops work and which laptops don’t.

The solution is basically a database or CSV of post codes, each record will contain the first part of the postcode and the latitude and longitude. What you will need is the SQL file or the CSV file and a bit of old school mathematics. I have also included the county or area in both SQL and CSV, you will not need these, but I have included them anyway as they might help you.

Download the CSV here.

Download the SQL here.

To calculate the distance between the two points of latitude I will use the Haversine formula. This basically means the shortest distance over the earth’s surface as the crow fly’s (ignores any hills etc.). It is spherical trigonometry, much better than normal trigonometry as we are calculating the distances from two points on the earth’s surface. The Haversin formula assumes the earth is a perfect sphere which it is not, it is more ellipsoidal. Therefore this formula will work well for small distances and as we are working with just UK post codes then this is acceptable error margin. If you are looking to develop a project that uses world wide distances then you would probably be best looking at the Vencety formula.

The Haversine Formula Method

The first point we will use is CB2 (Cambridge) lat: 52.163, long: 0.133
The first point we will use is SS4 (Southend on Sea) lat: 51.594, long: 0.715$lat1 = 52.163 latitude of the first point
$long1 = 0.133 longitude of the first point

$lat2 = 51.594 latitude of the second point
$long2 = 0.715 longitude of the second point

$earth = 6373 the Earth’s mean radius, 6373 KM (according to wikipedia) we can also use miles 3960.

sine angle of lattitude
$sinelat = sin ( $lat2 - $lat1 )

sine angle of longitude
$sinelong= sin ( $long2 - $long1 )

and the rest of the haversine formula
$a = ( $sinlat * $sinlat ) + cos ( $lat1 ) * cos ( $lat2 ) * ( $sinlong * $sinlong )

$c = 2 * asin ( min ( 1 , sqrt ( $a ) ) )

$d = round ( $earth * $c )

So the direct distance from post code CB2 to SS4 is 47 miles which is about right.

The above formula as a function:
< ?php

function getDistance($lat1, $long1, $lat2, $long2)
{
//$earth = 6371; //km change accordingly
$earth = 3960; //miles

//Point 1 cords
$lat1 = deg2rad($lat1);
$long1= deg2rad($long1);

//Point 2 cords
$lat2 = deg2rad($lat2);
$long2= deg2rad($long2);

//Haversine Formula
$dlong=$long2-$long1;
$dlat=$lat2-$lat1;

$sinlat=sin($dlat/2);
$sinlong=sin($dlong/2);

$a=($sinlat*$sinlat)+cos($lat1)*cos($lat2)*($sinlong*$sinlong);

$c=2*asin(min(1,sqrt($a)));

$d=round($earth*$c);

return $d;
}

// pull cords out of database

echo “Distance in miles from CB2 to SS4: “.getDistance(52.163, 0.133, 51.594, 0.715);
?>

I have also packaged a demo application to give you a better understanding.

You can view the demo working here.
You can view the source code or download it all zipped up.