At least two projects in the Forestry Section of the Iowa State College Agricultural Experiment Station now use, or are planning to use, aerial photographs as a basis for classifying forest stands, and stand height is one of the factors used in the classification.
Goodspeed, Allen W.
"Tree Height Determination From Aerial Photographs In Iowa,"
Ames Forester: Vol. 36
, Article 7.
Available at: https://lib.dr.iastate.edu/amesforester/vol36/iss2/7