| <?php | |
| /* | |
| * GeoPo Encode in PHP | |
| * @author : Shintaro Inagaki | |
| * @param $location (Array) | |
| * @return $geopo (String) | |
| */ | |
| function geopoEncode($lat, $lng) { | |
| // 64characters (number + big and small letter + hyphen + underscore) | |
| $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; | |
| $geopo = ""; | |
| $scale = 7; | |
| // Change a degree measure to a decimal number | |
| $lat = ($lat + 90) / 180 * pow(8, 10); | |
| $lng = ($lng + 180) / 360 * pow(8, 10); | |
| // Compute a GeoPo code from head and concatenate | |
| for($i = 0; $i < $scale; $i++) { | |
| $geopo .= substr($chars, floor($lat / pow(8, 9 - $i) % 8) + floor($lng / pow(8, 9 - $i) % 8) * 8, 1); | |
| } | |
| return $geopo; | |
| } | |
| /* | |
| * GeoPo Decode in PHP | |
| * @author : Shintaro Inagaki | |
| * @param $geopo (String) | |
| * @return $location (Array) | |
| */ | |
| function geopoDecode($geopo) { | |
| // 64characters (number + big and small letter + hyphen + underscore) | |
| $chars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; | |
| // Array for geolocation | |
| $location = array (); | |
| for ($i = 0; $i < strlen($geopo); $i++) { | |
| // What number of character that equal to a GeoPo code (0-63) | |
| $order = strpos($chars, substr($geopo, $i, 1)); | |
| // Lat/Lng plus geolocation value of scale | |
| $location['lat'] = $location['lat'] + floor($order % 8) * pow(8, 9 - $i); | |
| $location['lng'] = $location['lng'] + floor($order / 8) * pow(8, 9 - $i); | |
| } | |
| // Change a decimal number to a degree measure, and plus revised value that shift center of area | |
| $location['lat'] = $location['lat'] * 180 / pow(8, 10) + 180 / pow(8, strlen($geopo)) / 2 - 90; | |
| $location['lng'] = $location['lng'] * 360 / pow(8, 10) + 360 / pow(8, strlen($geopo)) / 2 - 180; | |
| $location['scale'] = strlen($geopo); | |
| return $location; | |
| } | |
| $conn = pg_connect("dbname=bus user=postgres password=snmc"); | |
| if (!$conn) { | |
| echo "An error occured.\n"; | |
| exit; | |
| } | |
| $xml = simplexml_load_file("04-locatebetweenpoints.osm"); | |
| /* Access the <rating> nodes of the first movie. | |
| * Output the rating scale, too. */ | |
| foreach ($xml->node as $node) { | |
| $geoPo = geopoEncode((float)$node['lat'],(float)$node['lon']); | |
| $node['lat'] = (int) ((float)$node['lat']*10000000); | |
| $node['lon'] = (int) ((float)$node['lon']*10000000); | |
| echo($node['lat'].",".$node['lon']."=$geoPo<br>"); | |
| $sql = "INSERT INTO stops (geohash, lat, lng) VALUES('$geoPo','{$node['lat']}','{$node['lon']}')"; | |
| $result = pg_query($conn, $sql); | |
| if (!$result) { | |
| echo("Error in SQL query: " . pg_last_error() ."<br>\n"); | |
| } | |
| flush(); | |
| } | |
| ?> | |