A Rapid Technique for the Evaluation of Mature Tree Crown Growth
John R. Seiler and Paul N. McBee
Abstract: A simple, rapid technique for estimation of projected tree crown area was evaluated. The technique utilizes photographs of tree crowns taken from two directions with an object of known scale present in each photograph. The photographs are then displayed onto a dot grid and the projected (two dimensional) crown surface area in square feet is estimated. Total height, crown width, and live crown length can also be estimated from the photographs. The estimates obtained from the photographs agree well with on-ground measurements of height and crown width. With this technique, reduction in growth due to pruning, growth regulator application or loss of vigor can be quantified.