File indexing completed on 2023-05-30 09:06:25

 #!/usr/bin/perl
 
 use LWP::Simple;
 use Image::Magick;
 
 print 'downloading image from server...' . "\n";
 $response = getstore('https://realearth.ssec.wisc.edu/cgi-bin/mapserv?map=globalir.map&layer=latest_globalir&mode=map&srs=EPSG:4326&width=40&height=20&bbox=-180,-90,180,90&format=image/jpg', 'clouds.jpg');
 die 'error downloading image' unless is_success($response);
 
 $clouds = Image::Magick->new();
 $clouds->ReadImage('clouds.jpg');
 
 print 'resizing source image...' . "\n";
 $clouds->Resize(width=>'2700', height=>'1350');
 
 sub tile {
     my ($x, $y, $level) = @_;
     
     $tile = $clouds->Clone();
     $tile->Crop(geometry=>'675x675+' . ($x * 675) . '+' . ($y * 675));
     
     $xstr = '00000' . $x;
     $ystr = '00000' . $y;
     
     mkdir($level . '/' . $ystr);
     $fname = $level . '/' . $ystr . '/' . $ystr . '_' . $xstr . '.jpg';
     print 'saving ' . $fname . '...' . "\n";
     $tile->Write($fname);
 }
 
 # level 1
 mkdir('1');
 for($x = 0; $x < 4; $x++) {
     for($y = 0; $y < 2; $y++) {
         tile($x, $y, '1');
     }
 }
 
 print 'resizing source image...' . "\n";
 $clouds->Resize(width=>'1350', height=>'675');
 
 # level 0
 mkdir('0');
 for($x = 0; $x < 2; $x++) {
     for($y = 0; $y < 1; $y++) {
         tile($x, $y, '0');
     }
 }
 
 # create expiration.txt
 open(EXP, '>', 'expiration.txt');
 print EXP 'Timestamp: ' . time . "\n";
 print EXP 'Expiration: 10800' . "\n";
 close(EXP);