If our robot were to lay down a large piece of plexi glass, and our alliance drives up onto it, would that count as lifted? Our alliance would be completely off the ground, but the plexi glass would be on the ground. Thanks for any responses! 
Provided that your robot meets all 4 criteria of the definition of Low Elevated, this would count as a Low Elevation. The criteria are:
In the situation you’ve described, you would need to pay careful attention to criteria #4.