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
Famous quotes containing the words aerial and/or measurement:
“Every year lays more earth upon us, which weighs us down from aerial regions, till we go under the earth at last.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)