These are forest measurement data from the Upper Flat Creek unit of the University of Idaho Experimental Forest, measured in 1991. The inventory was based on variable radius plots with 6.43 sq. m. per ha. BAF (Basal Area Factor). The forest stand was 121.5 ha.
A data frame with 633 observations on the following 12 variables.
tree diameter at 1.37 m. from the ground, measured in millimetres.
tree height measured in decimetres
tree height converted to feet
tree diameter converted to inches
predicted tree height in feet
tree height in metres
predicted tree height in metres
Plots that were measured with no trees are signified in the dataset by lines that have blank species codes and missing DBH.
The data are provided courtesy of Harold Osborne and Ross Appelgren of the University of Idaho Experimental Forest. The predicted height comes from the height/diameter model documented in Wykoff et al. (1982). The data and model were used in Robinson et al. (2005).
Robinson, A.P., R.A. Duursma, and J.D. Marshall. 2005. A regression-based equivalence test for model validation: shifting the burden of proof. Tree Physiology 25, 903-913.
Wykoff,W.R., N.L. Crookston, and A.R. Stage. 1982. User's guide to the stand Prognosis model. GTR-INT 133, USDA Forest Service, Intermountain Research Station, Ogden, UT, 113 p.
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