I have been looking for a set of links for all of the (Linked Open Data) LOD clouds so that I could have a pictorial description of how the LOD cloud has evolved since it was first assembled. Sadly there are no links to the old LOD clouds on from the LOD cloud’s home on the web.

So I hacked together a dirty perl script to see if I could guess the URLs for the old clouds, the code looks like so :

#!/usr/bin/perl

$rootUrl = ‘http://richard.cyganiak.de/2007/10/lod/’;

#now to brute force the URL mangling to grab all of the pictures

for ($i = 2007 ; $i < 2010; $i++) {
for ($j = 1 ; $j < 13; $j++) {
for ($k = 1; $k < 32; $k++) {
$stringToFetch = $rootUrl.”lod-datasets_$i-“.make_big($j).”-“.make_big($k).”.png”;

`wget $stringToFetch`;

}
}
}

#padding out string …
sub make_big($) {
my $string = shift;
if (length($string) == 1) {
$string = “0”.$string;
}
return $string;
}

After running the script I have found the following old instances of the LOD cloud :

Finally, I still don’t think I have the first LOD cloud, would love to know its URL if anyone out there knows it!

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