Yes...I noted those those tapered structures on LSJI when I was using Google Earth to have a look. Those structures appeared to be sitting in the island’s maintenance yard. At that time I concluded the tennis court was pretty bogus, and I never could reconcile what those frames might be.
In your LH pic I can make out a straight dump truck and a straight truck with a large tank on its frame. Very clear to me is a good-sized JD tractor with cab. Behind the JD there is a big liquid poop handling wagon. It seems to be too far away from the tractor for them both to be hooked up that point in time. Doesn’t matter.
Other than the soil in that landing being disturbed and tracked-in, I can’t put my finger on anything else.
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IIRC, you were the FReeQ who started me looking at the tennis court, right?
First off, somebody definitely mucked around with the DEM (Digital Elevation Model) in that region of the Google Earth database. If you tilt 'way over and increase "elevation exaggeration" (increase the multiplier for the numbers in the DEM) and, come in a few feet above sea level -- that hill always appears to come to a sharp point -- even where it was artificially flattened in the area of the tennis court.
That's why you got unbelievable elevation readings in that area! Obviously, Epstein put his money to work to hide what he was doing on that hilltop!
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Go back and look at that hilltop on the 11/30/2006 overflight. That's the one with the cluster of big round dots. Folks originally saw those as holes. I now see that they are dump truck loads of spoil dirt from underground excavations (tunneling, etc.)
In fact, I propose that that entire light-colored triangular section of hilltop is one big spoil dirt pile. If you look at the far northwestern point of that triangle, you can see a Bobcat. And, you can see that long line where it had been spreading out dirt piles. Also, around the edges of the "triangle", you can see where dirt was pushed off the pile onto the original surface.