Description Usage Arguments Details Value
The generalized equation that these parameters fit is as follows:
1 | getC1(x)
|
x |
This is your target dataframe. It must have four columns: DIA, b0, b1, and b2. If your target species does not use one of the parameters, just set it to 0 to cancel it out. |
CrownRadius = (b0 + b1*DIA + b2*DIA^2)/2
where b0, b1 and b2 are species-specific parameters. These were calculated extensively for our main Sierra Nevada study species by Bechtold WA (2004) Largest-Crown-Width Prediction Models for 53 Species in the Western United States. West J Appl For 19:245–251.
This function returns a single number, the mean crown ratio for the
values you entered. Use the doFxBySort
wrapper to get it for
multiple species, e.g.,
doFxBySort(getC1, "SPCD", c("DIA", "b0", "b1", "b2"), TreesCA)
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