yeah is not the first try of the guy , here earlier work by him that I totally fell in love
http://ryanwwatkins.blogspot.com/2013/07/udk-realtime-landscape.html
the first image still shocking me 
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please consider doing some sort of tutorials, videos if possible, it would be piece in the UE4 documentation
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do you have an idea if it’s possible to make a very large terrain (maybe with streaming) with visual quality
anyway very very god job ! well done !