I don't Konw How the geopdf from,But it can be analysised with TerraGo
Tools,I can get the  spatial infomation by using the tool,So I guess it is
specified by TerraGo.
http://itext-general.2136553.n4.nabble.com/file/n2547889/landusechange.pdf
landusechange.pdf 
this is the geopdf file.
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