/**
* Compute coordinates from Odd and Even Message (for bette result even message must be catched in first)
* @param \Kletellier\Adsb $adsb_odd
* @param \Kletellier\Adsb $adsb_even
* @return key value array with latitude and longitude keys
*/
public static function getCoordinates(\Kletellier\Adsb $adsb_odd, \Kletellier\Adsb $adsb_even)
{
$ret = array();
$cprlat_odd = $adsb_odd->getLatitude();
$cprlon_odd = $adsb_odd->getLongitude();
$cprlat_even = $adsb_even->getLatitude();
$cprlon_even = $adsb_even->getLongitude();
$dlat_even = 360.0 / 60;
$dlat_odd = 360.0 / 59;
// calculate Latitude index
$j = floor((59 * $cprlat_even - 60 * $cprlat_odd) / 131072 + 0.5);
$lat_even = $dlat_even * (self::modPos($j, 60) + $cprlat_even / 131072);
if ($lat_even >= 270) {
$lat_even = $lat_even - 360;
}
$lat_odd = $dlat_odd * (self::modPos($j, 59) + $cprlat_odd / 131072);
if ($lat_odd >= 270) {
$lat_odd = $lat_odd - 360;
}
if (self::cprNL($lat_even) == self::cprNL($lat_odd)) {
$lat = "";
$lon = "";
if ($adsb_even->getTs() > $adsb_odd->getTs()) {
$lat = $lat_even;
$ni = self::cprN($lat_even, 0);
$m = floor(($cprlon_even * (self::cprNL($lat_even) - 1) - $cprlon_odd * self::cprNL($lat_even)) / 131072.0 + 0.5);
$lon = 360.0 / $ni * (self::modPos($m, $ni) + $cprlon_even / 131072);
} else {
$lat = $lat_odd;
$ni = self::cprN($lat_odd, 1);
$m = floor(($cprlon_even * (self::cprNL($lat_odd) - 1) - $cprlon_odd * self::cprNL($lat_odd)) / 131072 + 0.5);
$lon = 360.0 / $ni * (self::modPos($m, $ni) + $cprlon_odd / 131072);
}
$lon -= floor(($lon + 180) / 360) * 360;
if ($lat > -91 && $lat < 91 && $lon > -181 && $lon < 181) {
$ret["longitude"] = $lon;
$ret["latitude"] = $lat;
} else {
$ret = FALSE;
}
} else {
// incorrect value
$ret = FALSE;
}
return $ret;
}
public function testJsonDecoding()
{
$inst = new Adsb("*8D503DB0200C61F550C8202BA2C7;");
$json = $inst->toJson();
$inst2 = new Adsb();
$inst2->fromJson($json);
$this->assertEquals($inst, $inst2);
}
