Altitude info?

I'm using Google Earth Pro - if that makes a difference.

I see some buildings, I want to see what trees are taller than the buildings, so I create polygon at the same height as the buildings. Oops, the height of the building as reported by Google Earth (100ft)
doesn't match the height of the polygon I create when I set it's altitude. I'm setting 34M in the altitude box and using "relative to sea floor".

The Polygon height seems to be located at about 200 ft,

Now, I'm assuming heights reported in the lower right area of the Google Earth window are reported as MSL. Right?

The numbers don't quite work out as GE says the streets are at 54 ft, but selecting "clamp to sea floor" on the polygon places at at about 3 ft above the street.

What's going on!

Thanks,

Joe

What happens if you try the other options in the Altitude selection box ? Maybe the ones that relate to the ground, buildings and trees might be more accurate.

Just a thought.

How about triangulating the tip of the tree with the ground like is done with real trees. Then meausre the distance  from tree base to tip at ground. 
Do I even know what I'm talking about?
I'm often struck by poplars or redwoods that tower over high-rise buildings.

Attachments:

Tall Street Tree San Mateo CA.kmz (834 B)