475 lines
15 KiB
PHP
475 lines
15 KiB
PHP
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<?php
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define ('SPEED_OF_LIGHT', 299792458); // in m/s
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define ('CIRCUMFERENCE_OF_EARTH', 40075000); // in m
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$cachefile = 'cached_locations';
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// If the cache file exists and it is younger than 1 min and 'flush' get var is is not set ...
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if (file_exists($cachefile)) {
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if (time() - filectime($cachefile) < 60 && !isset($_GET['flush'])) {
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// ... then read cache file and populate the $locations array with it
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$locations = unserialize(file_get_contents($cachefile));
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}
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}
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if ( !isset($locations) ) {
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// Otherwise scrape the information from the freifunk wiki, getting all info about the berlin nodes
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$index = file_get_contents('https://wiki.freifunk.net/Kategorie:Hamburg/Richtfunkstandort');
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preg_match_all("|<a href=\"/Hamburg/Richtfunknetz:(.*?)\" title=\"Hamburg/Richtfunknetz:(.*?)\"|", $index, $standorte, PREG_SET_ORDER);
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// echo "<pre>";
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// print_r ($standorte);
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// exit();
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foreach ($standorte as $standort) {
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unset($location);
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$location['url'] = "https://wiki.freifunk.net/Hamburg/Richtfunknetz:" . $standort[1];
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$location['name'] = $standort[2];
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$standort_page_src = file_get_contents($location['url'] . '?action=raw');
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preg_match("/{{Infobox Freifunk-Standort(.*?)\n}}/s", $standort_page_src, $matches);
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$infobox = $matches[1];
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foreach( explode( "| ", $infobox) as $pair) {
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list($name, $value) = explode(" = ", $pair);
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if ( strlen(trim($name)) && strlen(trim($value)) ) {
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$value = trim($value);
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$value = preg_replace('/\[\[(.*?)\|(.*?)\]\]/', '<a href="https://wiki.freifunk.net/$1">$2</a>', $value);
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$value = preg_replace('/\[\[(.*?)\]\]/', '<a href="https://wiki.freifunk.net/$1">$1</a>', $value);
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$value = preg_replace('/\{\{Knoten (.*?)\}\},?\s?/', '$1 (<a href="http://monitor.berlin.freifunk.net/host.php?h=$1">Monitor</a>, <a href="http://openwifimap.net//index.html#detail?node=$1.olsr">OWM</a>)<br>', $value);
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$value = preg_replace('/\[(.*?) (.*?)\]/', '<a href="$1">$2</a>', $value);
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$value = preg_replace('/([A-Za-z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})/', '<a href="mailto:$1">$1</a>', $value);
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$location[$name]=$value;
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}
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}
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if (trim($location['Koordinaten'])) {
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list($location['lat'], $location['lon']) = explode(",", $location['Koordinaten']);
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unset($location['Koordinaten']);
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}
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if (strlen(trim($location['ueberNN'])) == 0) {
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$location['alt'] = 0;
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} else {
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$location['alt'] = $location['ueberNN'];
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}
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unset($location['ueberNN']);
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$locations[] = $location;
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}
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// And write the array to the cache file
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file_put_contents( $cachefile, serialize($locations) );
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}
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// Parse the variables Google Earth passes with each refresh as instructed by the first KML file.
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list ($cameraLon, $cameraLat, $cameraAlt) = explode(",", $_GET['VARS']);
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// Create links if the eye altitude is below 250 meters
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if (isset ($cameraAlt) && $cameraAlt < 250) {
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$survey_location['lat'] = $cameraLat;
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$survey_location['lon'] = $cameraLon;
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$survey_location['alt'] = $cameraAlt - 6;
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$survey_location['name'] = "Survey Location";
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foreach($locations as $location) {
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if ( $location['alt'] > 0 ) {
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unset($link);
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$link['name'] = $location['name'];
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$link['lat'] = $location['lat'];
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$link['lon'] = $location['lon'];
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$link['alt'] = $location['alt'];
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$link['distance'] = distance($survey_location, $link) . " m";
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$link['azimuth to'] = bearing($survey_location, $link) . "°";
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$link['elevation to'] = elevation($survey_location, $link) . "°";
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$link['azimuth from'] = bearing($link, $survey_location) . "°";
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$link['fspl_2.4'] = fspl( $link['distance'], 2400000000);
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$link['fspl_5'] = fspl( $link['distance'], 5000000000);
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$links[] = $link;
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}
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}
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// Sort the $links array by direction to $survey_location, starting north.
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if (isset($links)) {
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foreach ($links as $key => $link) {
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$direction[$key] = $link['azimuth to'];
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}
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array_multisort($direction, SORT_ASC, SORT_NUMERIC, $links);
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}
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$locations[] = $survey_location;
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}
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// This creates $kml which is what's output in the end
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$kml = headerKML();
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// First all the nodes in a non-expanding folder with a placemark icon.
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$kml .= '<Folder>';
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$kml .= '<name>Locations</name>';
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$kml .= '<Style><ListStyle><listItemType>checkHideChildren</listItemType><ItemIcon><href>http://maps.google.com/mapfiles/kml/shapes/placemark_circle.png</href></ItemIcon></ListStyle></Style>';
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foreach ($locations as $location) {
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if ($location['lat'] > 0){
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$kml .= '<Placemark>';
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$kml .= '<name>' . $location['name'] . '</name>';
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$kml .= '<description><![CDATA[' . balloonCSS();
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$kml .= '<h2><a href="' . $location['url'] . '">' . $location['name'] . '</a></h2>';
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$kml .= '<table>';
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foreach ($location as $name => $val) {
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if ($name !== 'name' && $name !== 'url') {
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$kml .= '<tr><td class="left">' . $name . ': </td><td>' . $val . '</td></tr>';
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}
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}
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$kml .= '</table>]]></description>';
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$kml .= '<styleUrl>#msn_placemark_circle</styleUrl>';
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$kml .= '<Point>';
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$kml .= '<altitudeMode>absolute</altitudeMode>';
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$kml .= '<coordinates>' . $location['lon'] . ',' . $location['lat'] . ',' . $location['alt'] . '</coordinates>';
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$kml .= '</Point>';
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$kml .= '</Placemark>' . "\n\n";
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}
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}
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$kml .= '</Folder>';
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// And then all the links if we have a survey location (i.e. we're under 250 m altitude)
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if (isset($links)) {
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$kml .= "<Folder><name>Links (clockwise from north)</name><open>1</open><visibility>1</visibility>\n\n";
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foreach ($links as $link) {
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$kml .= '<Folder>';
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$kml .= '<name>Link to ' . $link['name'] . ' (' . number_format($link['distance'] / 1000, 1) . ' km)</name><visibility>1</visibility>';
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$kml .= '<Style><ListStyle><listItemType>checkHideChildren</listItemType><ItemIcon><href>empty_icon.png</href></ItemIcon></ListStyle></Style>';
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$kml .= '<Placemark>';
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$kml .= '<name>Line with screen to ground</name>';
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$kml .= '<styleUrl>#line</styleUrl>';
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$kml .= '<LineString>';
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$kml .= '<extrude>1</extrude>';
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$kml .= '<altitudeMode>absolute</altitudeMode>';
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$kml .= '<coordinates>' . $link['lon'] . ',' . $link['lat'] . ',' . $link['alt'] . ',' . $survey_location['lon'] . ',' . $survey_location['lat'] . ',' . ( $survey_location['alt'] ) . '</coordinates>';
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$kml .= '</LineString>';
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$kml .= '</Placemark>' . "\n";
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$kml .= '<Placemark>';
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$kml .= '<name>2.4 GHz fresnel zone</name>';
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$kml .= '<snippet></snippet>';
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$kml .= '<description><![CDATA[' . balloonCSS();
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$kml .= '<h2>Link to ' . $link['name'] . ' (' . number_format($link['distance'] / 1000, 1) . ' km)</h2>';
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$kml .= '<table>';
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$kml .= '<tr><td class="left">distance: </td><td>' . $link['distance'] . '</td></tr>';
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$kml .= '<tr><td class="left">azimuth to: </td><td>' . $link['azimuth to'] . '</td></tr>';
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$kml .= '<tr><td class="left">elevation to: </td><td>' . $link['elevation to'] . '</td></tr>';
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$kml .= '<tr><td class="left">azimuth from: </td><td>' . $link['azimuth from'] . '</td></tr>';
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$kml .= '<tr><td class="left"><a href="https://en.wikipedia.org/wiki/Free-space_path_loss">FSPL</a>: </td><td>' . $link['fspl_2.4'] . ' dB @ 2.4 GHz<br>' . $link['fspl_5'] . ' dB @ 5 GHz</td></tr>';
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$kml .= '</table>]]></description>';
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$kml .= '<styleUrl>#polygon-transparent</styleUrl>';
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$kml .= '<MultiGeometry>' . "\n\n";
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$kml .= makeFresnelPolygons( $survey_location, $link, 2400000000, 20);
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$kml .= '</MultiGeometry>' . "\n\n";
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$kml .= '</Placemark>';
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$kml .= '<Placemark>';
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$kml .= '<name>5 GHz fresnel zone</name>';
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$kml .= '<styleUrl>#polygon</styleUrl>';
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$kml .= '<MultiGeometry>' . "\n\n";
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$kml .= makeFresnelPolygons( $survey_location, $link, 5000000000,20);
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$kml .= '</MultiGeometry>' . "\n\n";
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$kml .= '</Placemark>';
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$kml .= '</Folder>' . "\n\n";
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}
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$kml .= '</Folder>';
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}
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$kml .= '</Document></kml>' . "\n";
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echo $kml;
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// The arguments to distance, bearing and elevation functions are arrays that expected to have keys
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// named 'lat', 'lon' and (except for bearing) 'alt'.
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function distance($from, $to) {
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$lat1 = deg2rad($from['lat']);
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$lon1 = deg2rad($from['lon']);
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$lat2 = deg2rad($to['lat']);
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$lon2 = deg2rad($to['lon']);
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$theta = $lon1 - $lon2;
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$dist = rad2deg( acos( sin($lat1) * sin($lat2) + cos($lat1) * cos($lat2) * cos($theta) ) ) * ( CIRCUMFERENCE_OF_EARTH / 360 );
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// Add the diagonal component using pythagoras
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// (even if diff minimal in most of our cases)
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$alt_diff = abs($from['alt'] - $to['alt']);
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$dist = sqrt( ($alt_diff * $alt_diff) + ($dist * $dist) );
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return intval ($dist);
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}
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function bearing($from, $to) {
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$lat1 = deg2rad($from['lat']);
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$lon1 = deg2rad($from['lon']);
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$lat2 = deg2rad($to['lat']);
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$lon2 = deg2rad($to['lon']);
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//difference in longitudinal coordinates
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$dLon = $lon2 - $lon1;
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//difference in the phi of latitudinal coordinates
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$dPhi = log(tan($lat2 / 2 + M_PI / 4) / tan($lat1 / 2 + M_PI / 4));
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//we need to recalculate $dLon if it is greater than pi
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if( abs($dLon) > M_PI ) {
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if($dLon > 0) {
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$dLon = (2 * M_PI - $dLon) * -1;
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} else {
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$dLon = 2 * M_PI + $dLon;
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}
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}
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//return the angle, normalized
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return ( rad2deg(atan2($dLon, $dPhi)) + 360 ) % 360;
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}
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function elevation($from, $to) {
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return intval(rad2deg(atan2( $to['alt'] - $from['alt'], distance($from, $to) )));
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}
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function fspl($dist, $freq) {
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return intval(20 * log10(((4 * M_PI) / SPEED_OF_LIGHT) * $dist * $freq));
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}
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function makeFresnelPolygons($from, $to, $freq, $steps_in_circles) {
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// How many degrees is a meter?
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$lat_meter = 1 / ( CIRCUMFERENCE_OF_EARTH / 360 );
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$lon_meter = (1 / cos(deg2rad($from['lat']))) * $lat_meter;
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$distance = distance($from, $to);
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$bearing = bearing($from, $to);
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$wavelen = SPEED_OF_LIGHT / $freq; // Speed of light
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// $steps_in_path is an array of values between 0 (at $from) and 1 (at $to)
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// These are the distances where new polygons are started to show elipse
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// First we do that at some fixed fractions of path
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$steps_in_path = array(0,0.25,0.4);
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// Then we add some steps set in meters because that looks better at
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// the ends of the beam
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foreach (array(0.3,1,2,4,7,10,20,40,70,100) as $meters) {
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// calculate fraction of path
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$steps_in_path[] = $meters / $distance;
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}
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// Add the reverse of these steps on other side of beam
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$temp = $steps_in_path;
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foreach ($temp as $step) {
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$steps_in_path[] = 1 - $step;
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}
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// Sort and remove duplicates
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sort($steps_in_path, SORT_NUMERIC);
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$steps_in_path = array_unique($steps_in_path);
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// Fill array $rings with arrays that each hold a ring of points surrounding the beam
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foreach ($steps_in_path as $step) {
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$centerpoint['lat'] = $from['lat'] + ( ($to['lat'] - $from['lat']) * $step );
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$centerpoint['lon'] = $from['lon'] + ( ($to['lon'] - $from['lon']) * $step );
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$centerpoint['alt'] = $from['alt'] + ( ($to['alt'] - $from['alt']) * $step );
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// Fresnel radius calculation
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$d1 = $distance * $step;
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$d2 = $distance - $d1;
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$radius = sqrt( ($wavelen * $d1 * $d2) / $distance );
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// Bearing of line perpendicular to bearing of line of sight.
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$ring_bearing = $bearing + 90 % 360;
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unset ($ring);
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for ($n=0; $n<$steps_in_circles; $n++) {
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$angle = $n * ( 360 / $steps_in_circles );
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$vertical_factor = cos(deg2rad($angle));
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$horizontal_factor = sin(deg2rad($angle));
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$lat_factor = cos(deg2rad($ring_bearing)) * $horizontal_factor;
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$lon_factor = sin(deg2rad($ring_bearing)) * $horizontal_factor;
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$new_point['lat'] = $centerpoint['lat'] + ($lat_factor * $lat_meter * $radius);
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$new_point['lon'] = $centerpoint['lon'] + ($lon_factor * $lon_meter * $radius);
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$new_point['alt'] = $centerpoint['alt'] + ($vertical_factor * $radius);
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$ring[] = $new_point;
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}
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$rings[] = $ring;
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|
|
||
|
|
}
|
||
|
|
|
||
|
|
// Make the polygons
|
||
|
|
|
||
|
|
// since polygons connect this ring with next, skip last one.
|
||
|
|
for ($ring_nr = 0; $ring_nr < count($rings) - 1; $ring_nr++) {
|
||
|
|
|
||
|
|
$next_ring_nr = $ring_nr + 1;
|
||
|
|
|
||
|
|
for ($point_nr = 0; $point_nr < $steps_in_circles; $point_nr++) {
|
||
|
|
|
||
|
|
$next_point_nr = $point_nr + 1;
|
||
|
|
if ($point_nr == $steps_in_circles - 1) {
|
||
|
|
$next_point_nr = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
unset ($polygon);
|
||
|
|
$polygon[] = $rings[$ring_nr][$point_nr];
|
||
|
|
$polygon[] = $rings[$next_ring_nr][$point_nr];
|
||
|
|
$polygon[] = $rings[$next_ring_nr][$next_point_nr];
|
||
|
|
$polygon[] = $rings[$ring_nr][$next_point_nr];
|
||
|
|
|
||
|
|
$polygons[] = $polygon;
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret = '';
|
||
|
|
|
||
|
|
foreach ($polygons as $polygon) {
|
||
|
|
$ret .= '<Polygon><altitudeMode>absolute</altitudeMode><outerBoundaryIs><LinearRing><coordinates>';
|
||
|
|
|
||
|
|
foreach ($polygon as $point) {
|
||
|
|
$ret .= $point['lon'] . ',' . $point['lat'] . ',' . $point['alt'] . " ";
|
||
|
|
}
|
||
|
|
|
||
|
|
$ret .= '</coordinates></LinearRing></outerBoundaryIs></Polygon>';
|
||
|
|
}
|
||
|
|
|
||
|
|
return $ret;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
function headerKML() {
|
||
|
|
|
||
|
|
$kml = <<<HEREDOC
|
||
|
|
<?xml version="1.0" encoding="UTF-8"?>
|
||
|
|
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
|
||
|
|
<Document>
|
||
|
|
<name>line-of-sight.php</name>
|
||
|
|
<open>1</open>
|
||
|
|
<Style id="sh_placemark_circle_highlight">
|
||
|
|
<IconStyle>
|
||
|
|
<scale>1.7</scale>
|
||
|
|
<Icon>
|
||
|
|
<href>http://maps.google.com/mapfiles/kml/shapes/placemark_circle_highlight.png</href>
|
||
|
|
</Icon>
|
||
|
|
</IconStyle>
|
||
|
|
<BalloonStyle id="balloon">
|
||
|
|
<bgColor>ff6c3adf</bgColor>
|
||
|
|
<textColor>ff000000</textColor>
|
||
|
|
<text>$[description]</text>
|
||
|
|
<displayMode>default</displayMode>
|
||
|
|
</BalloonStyle>
|
||
|
|
</Style>
|
||
|
|
<Style id="sn_placemark_circle">
|
||
|
|
<IconStyle>
|
||
|
|
<scale>1.3</scale>
|
||
|
|
<Icon>
|
||
|
|
<href>http://maps.google.com/mapfiles/kml/shapes/placemark_circle.png</href>
|
||
|
|
</Icon>
|
||
|
|
</IconStyle>
|
||
|
|
<BalloonStyle id="balloon">
|
||
|
|
<bgColor>ff6c3adf</bgColor>
|
||
|
|
<textColor>ff000000</textColor>
|
||
|
|
<text>$[description]</text>
|
||
|
|
<displayMode>default</displayMode>
|
||
|
|
</BalloonStyle>
|
||
|
|
</Style>
|
||
|
|
<StyleMap id="msn_placemark_circle">
|
||
|
|
<Pair>
|
||
|
|
<key>normal</key>
|
||
|
|
<styleUrl>#sn_placemark_circle</styleUrl>
|
||
|
|
</Pair>
|
||
|
|
<Pair>
|
||
|
|
<key>highlight</key>
|
||
|
|
<styleUrl>#sh_placemark_circle_highlight</styleUrl>
|
||
|
|
</Pair>
|
||
|
|
</StyleMap>
|
||
|
|
<Style id="line">
|
||
|
|
<LineStyle>
|
||
|
|
<width>1</width>
|
||
|
|
<color>ff000000</color>
|
||
|
|
</LineStyle>
|
||
|
|
<PolyStyle>
|
||
|
|
<color>a0ffffff</color>
|
||
|
|
</PolyStyle>
|
||
|
|
<BalloonStyle id="balloon">
|
||
|
|
<bgColor>ff6c3adf</bgColor>
|
||
|
|
<textColor>ff000000</textColor>
|
||
|
|
<text>$[description]</text>
|
||
|
|
<displayMode>default</displayMode>
|
||
|
|
</BalloonStyle>
|
||
|
|
</Style>
|
||
|
|
<Style id="polygon">
|
||
|
|
<LineStyle>
|
||
|
|
<width>1</width>
|
||
|
|
<color>ff006000</color>
|
||
|
|
</LineStyle>
|
||
|
|
<PolyStyle>
|
||
|
|
<color>ff50ff50</color>
|
||
|
|
</PolyStyle>
|
||
|
|
<BalloonStyle id="balloon">
|
||
|
|
<bgColor>ff6c3adf</bgColor>
|
||
|
|
<textColor>ff000000</textColor>
|
||
|
|
<text>$[description]</text>
|
||
|
|
<displayMode>default</displayMode>
|
||
|
|
</BalloonStyle>
|
||
|
|
</Style>
|
||
|
|
<Style id="polygon-transparent">
|
||
|
|
<LineStyle>
|
||
|
|
<width>1</width>
|
||
|
|
<color>4000ff00</color>
|
||
|
|
</LineStyle>
|
||
|
|
<PolyStyle>
|
||
|
|
<color>8000ff00</color>
|
||
|
|
</PolyStyle>
|
||
|
|
<BalloonStyle id="balloon">
|
||
|
|
<bgColor>ff6c3adf</bgColor>
|
||
|
|
<textColor>ff000000</textColor>
|
||
|
|
<text>$[description]</text>
|
||
|
|
<displayMode>default</displayMode>
|
||
|
|
</BalloonStyle>
|
||
|
|
</Style>
|
||
|
|
HEREDOC;
|
||
|
|
|
||
|
|
return $kml;
|
||
|
|
}
|
||
|
|
|
||
|
|
function balloonCSS() {
|
||
|
|
|
||
|
|
// There is no global stylesheet in Google Earth, so this needs to be appended to each balloon to make it display nicely.
|
||
|
|
$css = <<<HEREDOC
|
||
|
|
<style type="text/css">
|
||
|
|
a:link {text-decoration: none;}
|
||
|
|
td.left {text-align: right; vertical-align: top; margin-bottom: 5px;}
|
||
|
|
td, h2 {white-space: nowrap; font-family: verdana;}
|
||
|
|
</style>
|
||
|
|
HEREDOC;
|
||
|
|
|
||
|
|
return $css;
|
||
|
|
}
|
||
|
|
|
||
|
|
?>
|