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.
Usage
data(ufc)
Arguments
Format
A data frame with 633 observations on the following 12 variables.
Plot
plot label
Tree
tree label
Species
species kbd
Dbh
tree diameter at 1.37 m. from the ground, measured
in millimetres.
Height
tree height measured in decimetres
Height.ft
tree height converted to feet
Dbh.in
tree diameter converted to inches
Height.ft.p
predicted tree height in feet
Height.m
tree height in metres
Height.m.p
predicted tree height in metres
Source
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).
Details
Plots that were measured with no trees are signified in the dataset by
lines that have blank species codes and missing DBH.
References
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.