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tracker.pl
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tracker.pl
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#!/usr/bin/perl
print "Content-Type: application/vnd.google-earth.kml+xml\n\n";
use constant PI => 4 * atan2(1, 1);
use CGI qw/:standard/; # load standard CGI routines
use CGI::Carp qw(fatalsToBrowser);
use Math::Trig;
use POSIX;
use Astro::Coord::ECI::TLE;
use LWP::Simple;
use Error qw(:try);
$query = new CGI;
$idvalues = $query->param('id');
$urlvalue = $query->param('url');
$hor = $query->param('hor');
$path = $query->param('path');
$extrude = $query->param('ex');
$icon_path= $query->param('icon');
if (!$idvalues) {
$idvalues = "25544";
}
if (!$urlvalue) {
$urlvalue = "http://celestrak.com/NORAD/elements/visual.txt";
}
if (!$hor) {
$hor = "Y";
}
if (!$path) {
$path = 2;
}
if ($path eq "N") {
$path = 0;
}
if (!$extrude) {
$extrude = 1;
}
if ($extrude eq 'Y') {
$extrude = 1;
}
if ($extrude eq 'N') {
$extrude = 0;
}
#truncate path to 24hrs at most
if ($path > 24) {
$path = 24;
}
my @idvalues = split(',', $idvalues);
my @color_array = ('BBFFBB','FFBBBB','BBBBFF');
print "
<Document>
<Style id='PolyStyle'>
<LineStyle>
<width>0</width>
</LineStyle>
<PolyStyle>
<tessellate>0</tessellate>
<altitudeMode>relativetoGround</altitudeMode>
<colorMode>normal</colorMode>
<fill>1</fill>
<outline>1</outline>
</PolyStyle>
</Style>
";
$content = get($urlvalue);
my @sats = Astro::Coord::ECI::TLE->parse ($content);
$satcount = 0;
foreach my $tle (@sats) {
if ($satcount > 50) {
#give message that server is overloaded
print "<Placemark>
<name>Too Many Objects Listed</name>
</Placemark>
";
} else {
if ( ((grep $_ eq $tle->get('id'), @idvalues) || ($idvalues eq 'ALL' )) ) {
$this_id = $tle->get('id');
if (!$icon_path) {
$filepath = "../resources.orbitingfrog.com/$this_id.png";
if(-e $filepath){
$this_icon_path = "http://resources.orbitingfrog.com/$this_id.png";
} else {
$this_icon_path = "http://resources.orbitingfrog.com/25544.png";
};
} else {
$this_icon_path = $icon_path;
};
$satcount = $satcount + 1;
my $now = time();
my $timestep = 120;
my $iterations = 30*$path;
$kml1 = "";
$kml2 = "";
$kmlr = "";
$col = $color_array[$satcount-1];
$satname = $tle->get('name');
$satname =~ s/\///g;
$satname =~ s/\&//g;
#do error checking for this TLE set
try {
@latlon = $tle->universal ($now)->geodetic();
return;
}
catch Error with {
my $ex = $tle->get('model_error'); # Get hold of the exception object
if ($ex == 4) {
print "<Placemark><name>Error with this TLE data.</name></Placemark>";
}
$error = 'TRUE';
}
finally {
"";
}; # <-- Remember the semicolon
if ($error eq 'TRUE') {
#do nothing
} else {
#loop through tracing out path of satellite
# for ($it = 0; $it < $iterations; ++$it) {
$time = $now + ($it*$timestep);
@latlon = $tle->universal ($time)->geodetic ();
$coords[$it][0] = $latlon[0]*180/PI;
$coords[$it][1] = $latlon[1]*180/PI;
$coords[$it][2] = $latlon[2]*1000;
}
$t = 0;
foreach $point (@coords) {
$kml1 = $kml1.$coords[$t][1].",".$coords[$t][0].",".$coords[$t][2]."
";
$t++;
}
#find location of satellite now
@latlon = $tle->universal ($now)->geodetic ();
my @xyz = $tle->eci ();
#now compute horizon distance for satellite
$alt = $latlon[2]*1000.0; #height of sat in metres
$horizon = 3.86*sqrt($alt);
if ($horizon > 40041470) {
$horizon = 40041470;
}
#lat long coordinates in radians
$lat = $latlon[0];
$long = $latlon[1];
$d_rad = $horizon*1000.0/6378000;
if ($hor eq "Y") {
#loop through the array and write path linestrings
for($i=0; $i<=360; ++$i) {
$radial = deg2rad($i);
$lat_rad = asin(sin($lat)*cos($d_rad) + cos($lat)*sin($d_rad)*cos($radial));
$dlon_rad = atan2(sin($radial)*sin($d_rad)*cos($lat),cos($d_rad)-sin($lat)*sin($lat_rad));
$lon_rad = $long + $dlon_rad;
if ($long < 0) {
$lon_rad2 = $long + $dlon_rad + (2*PI);
} elsif ($long >= 0) {
$lon_rad2 = $long + $dlon_rad - (2*PI);
}
if ($lon_rad < -&PI) {
$lon_rad = -&PI;
} elsif ($lon_rad > PI) {
$lon_rad = PI;
}
if ($lon_rad2 < -&PI) {
$lon_rad2 = -&PI;
} elsif ($lon_rad2 > PI) {
$lon_rad2 = PI;
}
$kmlr = $kmlr.rad2deg($lon_rad).",".rad2deg($lat_rad).",0 \n";
$kmlr2 = $kmlr2.rad2deg($lon_rad2).",".rad2deg($lat_rad).",0 \n";
}
}
$desc = "Current altitude: ".(sprintf("%.2f", $latlon[2]))." km<br>";
print "
<Folder>
<name>".$satname."</name>
<Style id='iss_style'>
<IconStyle>
<scale>1.2</scale>
<Icon>
<href>".$this_icon_path."</href>
</Icon>
</IconStyle>
</Style>
<LookAt>
<longitude>".$latlon[1]*180/PI."</longitude>
<latitude>".$latlon[0]*180/PI."</latitude>
<altitude>".($latlon[2]*1000.0)."</altitude>
<range>3000000</range>
<tilt>45</tilt>
</LookAt>
<Placemark>
<Style>
<BalloonStyle>
<bgColor>7fffffff</bgColor>
<text><![CDATA[
<strong>".$satname."</strong>
<br/><br/>
".$desc."
]]></text>
</BalloonStyle>
</Style>
<name>".$satname."</name>
<description><![CDATA[
".$desc."
]]></description>
<styleUrl>#iss_style</styleUrl>
<LookAt>
<longitude>".$latlon[1]*180/PI."</longitude>
<latitude>".$latlon[0]*180/PI."</latitude>
<altitude>".($latlon[2]*1000.0)."</altitude>
<range>3000000</range>
<tilt>45</tilt>
</LookAt>
<Point>
<extrude>".$extrude."</extrude>
<altitudeMode>relativeToGround</altitudeMode>
<coordinates>".$latlon[1]*180/PI.",".$latlon[0]*180/PI.",".($latlon[2]*1000.0)."</coordinates>
</Point>
</Placemark>
";
#if path is to be drawn, draw it
print "<Placemark>
<name>".$path." Hour Flight Path</name>
<Style>
<LineStyle>
<color>cc".$col."</color>
<width>2</width>
</LineStyle>
</Style>
<LineString>
<tessellate>1</tessellate>
<altitudeMode>relativeToGround</altitudeMode>
<coordinates>".$kml1."</coordinates>
</LineString>
</Placemark>
";
#if horixon is to be drawn, draw it now
if ($hor eq "Y") {
print "<Placemark>
<Style id='PolyStyle'>
<LineStyle>
<color>88".$col."</color>
</LineStyle>
<PolyStyle>
<color>88".$col."</color>
</PolyStyle>
</Style>
<name>".$plot." Horizon</name>
<styleUrl>#PolyStyle</styleUrl>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>".$kmlr."</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
<Placemark>
<name>".$plot." Horizon</name>
<styleUrl>#PolyStyle</styleUrl>
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>".$kmlr2."</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
";
}
#write ending tag
print "</Folder>";
#}
} else { #check sat id
# do nothing
}
}#end check limit of sources
} # end for each sat loop
print '
</Document>';