96 行
2.3 KiB
PHP
96 行
2.3 KiB
PHP
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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class Qra {
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// Name: QRA
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// Task: convert qra to lat/long
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function qra2latlong($strQRA)
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{
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return qra2latlong($strQRA);
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}
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function bearing($rx, $tx) {
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$my = qra2latlong($tx);
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$stn = qra2latlong($rx);
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$bearing = bearing($my[0], $my[1], $stn[0], $stn[1]);
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return $bearing;
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}
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}
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function distance($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
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$theta = $lon1 - $lon2;
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$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
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cos(deg2rad($theta));
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$dist = acos($dist);
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$dist = rad2deg($dist);
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$dist = $dist * 60 * 1.1515;
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if ($unit == "K") {
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$dist *= 1.609344;
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} else if ($unit == "N") {
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$dist *= 0.8684;
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}
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return round($dist, 1);
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}
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function bearing($lat1, $lon1, $lat2, $lon2) {
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if (round($lon1, 1) == round($lon2, 1)) {
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if ($lat1 < $lat2) {
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$bearing = 0;
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} else {
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$bearing = 180;
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}
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} else {
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$dist = distance($lat1, $lon1, $lat2, $lon2, 'N');
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$arad = acos((sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($dist / 60))) / (sin(deg2rad($dist
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/ 60)) * cos(deg2rad($lat1))));
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$bearing = $arad * 180 / pi();
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if (sin(deg2rad($lon2 - $lon1)) < 0) {
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$bearing = 360 - $bearing;
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}
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}
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$dirs = array("N","E","S","W");
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$rounded = round($bearing / 22.5) % 16;
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if (($rounded % 4) == 0) {
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$dir = $dirs[$rounded / 4];
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} else {
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$dir = $dirs[2 * floor(((floor($rounded / 4) + 1) % 4) / 2)];
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$dir .= $dirs[1 + 2 * floor($rounded / 8)];
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#if ($rounded % 2 == 1)
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# $dir = $dirs[round_to_int($rounded/4) % 4] . "-" . $dir;
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}
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$var_dist = "";
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#return $dir;
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if (isset($dist)) {
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$var_dist = $dist." miles";
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}
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return round($bearing, 0)."º ".$dir." ".$var_dist;
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}
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function qra2latlong($strQRA)
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{
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$strQRA = strtoupper($strQRA);
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if (strlen($strQRA) == 4) $strQRA .= "MM";
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if (!preg_match('/^[A-Z]{2}[0-9]{2}[A-Z]{2}$/',$strQRA)) return false;
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list($a,$b,$c,$d,$e,$f) = str_split($strQRA,1);
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$a = ord($a) - ord('A');
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$b = ord($b) - ord('A');
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$c = ord($c) - ord('0');
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$d = ord($d) - ord('0');
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$e = ord($e) - ord('A');
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$f = ord($f) - ord('A');
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$nLong = ($a*20) + ($c*2) + (($e+0.5)/12) - 180;
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$nLat = ($b*10) + $d + (($f+0.5)/24) - 90;
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$arLatLong = array($nLat,$nLong);
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return($arLatLong);
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}
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/* End of file Qra.php */
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