Cloudlog/application/libraries/Qra.php

95 wiersze
2.3 KiB
PHP

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Qra {
// Name: QRA
// Task: convert qra to lat/long
function qra2latlong($strQRA)
{
return qra2latlong($strQRA);
}
function bearing($tx, $rx) {
$my = qra2latlong($tx);
$stn = qra2latlong($rx);
$bearing = bearing($my[0], $my[1], $stn[0], $stn[1]);
return $bearing;
}
}
function distance($lat1, $lon1, $lat2, $lon2, $unit = 'M') {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) *
cos(deg2rad($theta));
$dist = acos($dist);
$dist = rad2deg($dist);
$dist = $dist * 60 * 1.1515;
if ($unit == "K") {
$dist *= 1.609344;
} else if ($unit == "N") {
$dist *= 0.8684;
}
return round($dist, 1);
}
function bearing($lat1, $lon1, $lat2, $lon2) {
if (round($lon1, 1) == round($lon2, 1)) {
if ($lat1 < $lat2) {
$bearing = 0;
} else {
$bearing = 180;
}
} else {
$dist = distance($lat1, $lon1, $lat2, $lon2, 'N');
$arad = acos((sin(deg2rad($lat2)) - sin(deg2rad($lat1)) * cos(deg2rad($dist / 60))) / (sin(deg2rad($dist
/ 60)) * cos(deg2rad($lat1))));
$bearing = $arad * 180 / pi();
if (sin(deg2rad($lon2 - $lon1)) < 0) {
$bearing = 360 - $bearing;
}
}
$dirs = array("N","E","S","W");
$rounded = round($bearing / 22.5) % 16;
if (($rounded % 4) == 0) {
$dir = $dirs[$rounded / 4];
} else {
$dir = $dirs[2 * floor(((floor($rounded / 4) + 1) % 4) / 2)];
$dir .= $dirs[1 + 2 * floor($rounded / 8)];
#if ($rounded % 2 == 1)
# $dir = $dirs[round_to_int($rounded/4) % 4] . "-" . $dir;
}
$var_dist = "";
#return $dir;
if (isset($dist)) {
$var_dist = $dist." miles";
}
return round($bearing, 0)."&#186; ".$dir." ".$var_dist;
}
function qra2latlong($strQRA)
{
$strQRA = strtoupper($strQRA);
if (strlen($strQRA) == 4) $strQRA .= "MM";
if (!preg_match('/^[A-Z]{2}[0-9]{2}[A-Z]{2}$/',$strQRA)) return false;
list($a,$b,$c,$d,$e,$f) = str_split($strQRA,1);
$a = ord($a) - ord('A');
$b = ord($b) - ord('A');
$c = ord($c) - ord('0');
$d = ord($d) - ord('0');
$e = ord($e) - ord('A');
$f = ord($f) - ord('A');
$nLong = ($a*20) + ($c*2) + (($e+0.5)/12) - 180;
$nLat = ($b*10) + $d + (($f+0.5)/24) - 90;
$arLatLong = array($nLat,$nLong);
return($arLatLong);
}
/* End of file Qra.php */