| http://www.w3.org/ns/prov#value | - Well, in total the world has less than one sensor for every sixty thousand square kilometers; about three quarters of them are closely grouped in the United States, western Europe, and the militarily significant part of southeastern Russia; almost none have trustworthy time-of-readings records for more than a few years; most of the records are both short and discontinuous; most of the readings are
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