function checkAirspace($filename)
{
$lines = file($filename);
if (!$lines) {
echo "Cant read file";
return;
}
$i = 0;
// find bounding box of flight
$min_lat = 1000;
$max_lat = -1000;
$min_lon = 1000;
$max_lon = -1000;
foreach ($lines as $line) {
$line = trim($line);
if (strlen($line) == 0) {
continue;
}
if ($line[0] == 'B') {
if (strlen($line) < 23) {
continue;
}
$thisPoint = new gpsPoint($line, 0);
if ($thisPoint->lat > $max_lat) {
$max_lat = $thisPoint->lat;
}
if ($thisPoint->lat < $min_lat) {
$min_lat = $thisPoint->lat;
}
if (-$thisPoint->lon > $max_lon) {
$max_lon = -$thisPoint->lon;
}
if (-$thisPoint->lon < $min_lon) {
$min_lon = -$thisPoint->lon;
}
}
}
// echo "$min_lat, $max_lat,$min_lon, $max_lon<BR>";
// now find the bounding boxes that have common points
// !( A1<X0 || A0>X1 ) && !( B1<Y0 || B0>Y1 )
// X,A -> lon
// Y,B -> lat
// X0 -> $min_lon A0-> $area->minx
// X1 -> $max_lon A1-> $area->maxx
// Y0 -> $min_lat B0-> $area->miny
// Y1 -> $max_lat B1-> $area->maxy
// !( $area->maxx<$min_lon || $area->minx>$max_lon ) && !( $area->maxx<$min_lat || $area->miny>$max_lat )
global $AirspaceArea, $NumberOfAirspaceAreas;
getAirspaceFromDB($min_lon, $max_lon, $min_lat, $max_lat);
$NumberOfAirspaceAreas = count($AirspaceArea);
/*
foreach($AirspaceArea as $i=>$area) {
if ( !( $area->maxx<$min_lon || $area->minx>$max_lon ) &&
!( $area->maxy<$min_lat || $area->miny>$max_lat )
) {
if ($area->Shape==1) $shape="Area "; else $shape="Circle";
DEBUG("checkAirspace",1, "Found $shape [$i] => ".$area->Name.'<BR>');
// print_r($area);
if ($area->Shape==1) {
$area->Points[]=$area->Points[0];
// $area->NumPoints=count($area->Points);
}
$selAirspaceArea[]=$area;
}
}
$AirspaceArea=$selAirspaceArea;
$NumberOfAirspaceAreas=count($AirspaceArea);
*/
// echo '<HR>';
// print_r($AirspaceArea);
// echo '<HR>';
// echo '<HR>';
$violations = array();
$i = 0;
foreach ($lines as $line) {
$line = trim($line);
if (strlen($line) == 0) {
continue;
}
if ($line[0] == 'B') {
if (strlen($line) < 23) {
continue;
}
$thisPoint = new gpsPoint($line, 0);
$alt = $thisPoint->getAlt(1);
// prefer vario alt
// $insideArea=-1;
$insideAreas = array();
$insideAreas = FindAirspaceArea(-$thisPoint->lon, $thisPoint->lat, $alt);
if (count($insideAreas) > 0) {
//echo "point [$i] INSIDE AIRSPACE areas: ";
//foreach($insideAreas as $areaInfo) echo $AirspaceArea[$areaInfo[0]]->Name." areaID[$areaInfo[0]] disInside[$areaInfo[1]] altInside[$areaInfo[2]] ";
foreach ($insideAreas as $areaInfo) {
$areaID = $areaInfo[0];
$disInside = $areaInfo[1];
$altInside = $areaInfo[2];
if ($disInside > $violations[$areaID]['maxDistance']) {
$violations[$areaID]['maxDistance'] = $disInside;
}
if ($altInside > $violations[$areaID]['maxAlt']) {
$violations[$areaID]['maxAlt'] = $altInside;
}
}
//echo "<BR>";
} else {
// echo "OK<BR>";
}
$i++;
}
}
$resStr = '';
$resStr1 = '';
if (count($violations) > 0) {
foreach ($violations as $i => $violatedArea) {
$resStr1 .= $AirspaceArea[$i]->id . ",";
$resStr .= "HorDist: " . floor($violatedArea['maxDistance']) . "m, VertDist:" . floor($violatedArea['maxAlt']) . "m, ";
$resStr .= 'Airspace: ' . $AirspaceArea[$i]->Name . ' [' . $AirspaceArea[$i]->Type . '] ' . floor($AirspaceArea[$i]->Base->Altitude) . '-' . floor($AirspaceArea[$i]->Top->Altitude) . "m\n";
// COMMENT: '.$AirspaceArea[$i]->Comment."\n";
}
if ($resStr1) {
$resStr1 = substr($resStr1, 0, -1) . "\n";
$resStr = trim($resStr);
}
}
//$m1=memory_get_usage();
//echo "ReadAltitude: mem usage: $m1 <BR>";
return $resStr1 . $resStr;
}
$max_lon = $_REQUEST['max_lon'];
$min_lat = $_REQUEST['min_lat'];
$max_lat = $_REQUEST['max_lat'];
//Mod. P. Wild 5.10.2009 - show a few more airspaces around track (increase proximity level)
// show a bit more airspaces around the flight
// Manolis 09.12.2009
// put in the config variable $CONF['airspace']['zoom']
if ($CONF['airspace']['zoom'] && $CONF['airspace']['zoom'] != 100) {
// $zoom=102; //Percentage
$zoom = $CONF['airspace']['zoom'];
$min_lon = $min_lon + $min_lon * (100 - $zoom) / 100;
$max_lon = $max_lon + $max_lon * ($zoom - 100) / 100;
$min_lat = $min_lat + $min_lat * (100 - $zoom) / 100;
$max_lat = $max_lat + $max_lat * ($zoom - 100) / 100;
}
getAirspaceFromDB($min_lon, $max_lon, $min_lat, $max_lat);
$NumberOfAirspaceAreas = count($AirspaceArea);
// echo " // found( $NumberOfAirspaceAreas) areas $min_lon , $max_lon , $min_lat ,$max_lat <BR>";
$res = '{ "airspaces": [ ';
$i = 0;
foreach ($AirspaceArea as $i => $area) {
if ($i > 0) {
$res .= " ,\n";
}
$points = "";
if ($area->Shape == 1) {
// area
for ($j = 0; $j < $area->NumPoints; $j++) {
if ($j > 0) {
$points .= " ,";
}