First Principal...
Thankyou.
From what we do know, LiDAR seems to be the best shot.
For one, it will show the Bulldozer tracks and where the BD was working.
Secondly, if the detached engine was missed by the BD, then there will be a bright spot or a lump on the ground.
Similarly, the scan will show any change to the natural flow of the land.
Finally the Lat/Long availability within the readout will give us a pinpoint or targets that we can follow with the handheld GPS units.
I thought that maybe the U.S. Army has the treetop capability with airborne GPR but I am advised that it does not. Moving a trollied GPR Unit over the terrain there is just absolutely impossible.
One has to do the research if only to solve a problem which has to be dispersed...