I think X-Plane is using texture splatting.
Please read this blog post from Ben Supnik (X-Plane scenery developer) that
I read a few years ago:
http://www.x-plane.com/blog/2008/12/dealing-with-repetition/
It deals not exactly with the smooth transition problem, but this technique
could be applied to FlightGear terrain, too.
for more information on texture splatting:
http://en.wikipedia.org/wiki/Texture_splatting
cheers,
Robert
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