无法访问OSM数据库

Question

I am trying to get the speed limit using the OSM through php. But, I am unable to do that because I am getting the message as written below:

The data included in this document is from www.openstreetmap.org. The data is made available under ODbL.

What could be the problem? Below is my php file. Note: the code is still incomplete, I'm for now testing if I am able to access the OSM database.. But I cant. I hope someone could point me to the right direction..

 <?php

$lat  = 24.32633;
$lng = 54.58061;

$latm = -0.00015 + $lat;
$latp = 0.00015 + $lat;
$lngm = -0.00015 + $lng;
$lngp = 0.00015 + $lng;

//$json_url = 'http://overpass-api.de/api/interpreter?data=[out:json];node(24.326180, 54.580460,24.336580, 54.580860);way(bn);(._;>;);out;';
$json_url = 'http://overpass.osm.rambler.ru/cgi/interpreter';
$data = '<query type="way"> <bbox-query s="' . $lngm . '" w="' . $latm . '" n="' . $lngp . '" e="' . $latp . '"/> <!--this is auto-completed with the current map view coordinates.--> </query> <print/>';
$ch = curl_init( $json_url );

$options = array(
CURLOPT_POST => true,
CURLOPT_HTTPHEADER => array('Content-type: application/json') ,
CURLOPT_POSTFIELDS => $data,
CURLOPT_RETURNTRANSFER => true,
);

curl_setopt_array( $ch, $options );
$result =  curl_exec($ch);
echo curl_exec($ch);

/*$resultArr = explode("<",$result);
foreach ($resultArr as $val) {
    $temp = explode('"', $val);
    //check the size of the array, if it is == 5, then do
    if ($temp[1]=="maxspeed")
        $speedlimit=$temp[3];

}

echo '{"speedlimit": "120"}'; */
?>

Answer 1

Your bounding box is quite small and there's simply no data available in OpenStreetMap for your bounding box. That why you get the following almost empty, but valid result:

<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="Overpass API">
<note>The data included in this document is from www.openstreetmap.org. The data is made available under ODbL.</note>
<meta osm_base="2015-06-06T08:10:03Z"/>

  <bounds minlat="54.5805" minlon="24.3262" maxlat="54.5808" maxlon="24.3265"/>


</osm>

I would highly recommend to try different options in overpass turbo first to get more familiar with Overpass API. Please check the following link as a starting point: http://overpass-turbo.eu/s/9MQ - it's also restricted to highways with a maxspeed tag (that's what you're looking for, right?).

For illustration purposes, here's a screenshot with your tiny bounding box in the middle: