Aerial Measurement
Aerial photographs made at scales of 1:15,000 or larger can be used to determine crown closure estimates, usually done by ocular interpretation, by grouping stands into percent classes. Low density stands make for an easy ocular estimation, but as the stand density increases the ocular estimates become more difficult to obtain. In dense stands, overestimates or underestimates of crown closure can be made and predicting value of stand volume becomes more reduced.
Read more about this topic: Crown Closure
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