Listening for Quiet

On Oct 11, 9:03 pm, C J Campbell
wrote:

Pilots do try to maintain at least 2000' above wild areas as requested
by the National Park Service. However, planes taking off or landing
obviously are going to have to fly lower than 2000.' There are
additional aircraft that fly lower than 2000' for scientific and law

Where can I find the rules and regulations that specify how high
or low a plane can fly over various terrain, like cities, wilderness,
etc.
Also, is there an easy way from the ground to measure the height
of a flying plane?