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Search by distance

Thread began 9/14/2015 7:12 am by john70964 | Last modified 9/15/2015 1:15 pm by Ray Borduin | 136 views | 2 replies |

john70964

Search by distance

I wondered if there is a method to carry out a search by distance say from a post code or place name?

Thanks for any pointers.

John

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Ray BorduinWebAssist

You would have to store latitude and longitude coordinates for any locations you wanted a vicinity search for in the database. You can use Google's geocoding service to do that on the page where the address is entered on the insert or update page automatically.

Then you could use geocoding on the search page to get the latitude and longitude for a postal code or address they are using for a starting point.

Then you can use a complex SQL statement to get the results like:

php:
<?php

$radius 
20;
$sql 'SELECT * FROM locations  WHERE (3958*3.1415926*sqrt((Latitude-'.$lat.')*(Latitude-'.$lat.') + cos(Latitude/57.29578)*cos('.$lat.'/57.29578)*(Longitude-'.$lon.')*(Longitude-'.$lon.'))/180) <= '.$radius;
?>


This SQL assumes your locations table has columns named Latitude and Longitude and uses $lat and $lon as the calculated latitude and longitude from your search form.

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john70964

Thanks Ray
That most helpful, I have the idea now!

Regards

John

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