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I read in the editorial column of LiDAR  News (May 2015, Vol 5, no. 4) that one of the keynote speakers at ASPRS IGTF 2015 “highlighted the fact that in 2014, 4,500 earth imaging satellites were announced by 72 countries”. That’s a lot of satellites. And they are only the Earth observing ones. Granted that … More More and more and more