Geocoding: Location to Latitude/Longitude

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Both Google and Yahoo offer free geocoding services. Geocoding is the process of getting the latitude/longitude coordinates for a particular address or location. With the latitude/longitude coordinates you can fun things like plot markers on a map, calculate distances between points, etc. I have created two simple standalone functions to geocode an address, one for Google and one for Yahoo. Both require an API key.

Google Documentation Google API Key Yahoo Documentation Yahoo API Key

// API KEYS
 
$googleKey = "INSERT-API-KEY";
 
$yahooKey = "INSERT-API-KEY";
 
 
// ARRAY OF LOCATION PARAMETERS
 
$params = array();
 
$params['address'] = "2470 E Street";
 
$params['city'] = "San Diego";
 
$params['state'] = "CA";
 
$params['zip'] = "92102";
// GEOCODING USING GOOGLE
 
$coords = geocodeGoogle($params,$googleKey);
 
echo "Latitude: {$coords['latitude']}<br>\n";
 
echo "Longitude: {$coords['longitude']}<br>\n";
 
 
// GOOGLE GEOCODE FUNCTION
 
function geocodeGoogle($params,$key){
 
	$location = strtolower(str_replace(' ','+',"{$params['address']}, {$params['city']}, {$params['state']}, {$params['zipcode']}"));
 
	$url = "http://maps.google.com/maps/geo?q={$location}&output=csv&key={$key}";
 
	$response = file_get_contents($url);
 
	$parts = explode(',',$response);
 
	return array('latitude' => $parts[2], 'longitude' => $parts[3]);
 
}
// GEOCODING USING YAHOO
 
$coords = geocodeYahoo($params,$yahooKey);
 
echo "Latitude: {$coords['latitude']}<br>\n";
 
echo "Longitude: {$coords['longitude']}<br>\n";
 
 
// YAHOO GEOCODE FUNCTION
 
function geocodeYahoo($params,$key){
 
	$location = strtolower(str_replace(' ','+',"{$params['address']}, {$params['city']}, {$params['state']}, {$params['zipcode']}"));
 
	$url = "http://local.yahooapis.com/MapsService/V1/geocode?appid={$key}&location={$location}&output=php";
 
	$response = file_get_contents($url);
 
	$data = unserialize($response);
 
	return array('latitude' => $data['ResultSet']['Result']['Latitude'], 'longitude' => $data['ResultSet']['Result']['Longitude']);
 
}

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Published:
9.25.08 / 1pm
Category:
PHP
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