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