Graduate Thesis Or Dissertation
 

Modeling crown profile of Douglas-fir in the Western Willamette Valley

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9593v048g

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  • Crown profile was modeled using a system of equations with three components. The first equation predicts the maximum crown width of an open grown tree based on the tree's diameter at breast height. The second equation modifies maximum crown width to represent the largest width of the crown in stand grown trees. The third component of the system is a group of equations which model the relative position of a stand grown tree's largest crown width and modify the largest width of the crown to represent the width of the crown at all heights throughout the crown. Existing maximum crown width equations were scaled to match the geographic region of the Western Willamette Valley. Independent datasets and non-linear regression techniques were used to fit the remaining models. Equations for modeling crown widths at heights at and above the height of the largest crown width were highly predictive. Unfortunately, equations for modeling crown widths at lower heights than the largest crown width were considerably less accurate. Verification of the overall system indicated the presence of a small amount of bias, but the system produced a high level of accuracy even when the bias was included in predictions. Signature redacted for privacy
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