taper_kozak | R Documentation |
Kozak (2004) Taper Function.
taper_kozak(dbh, h, hih, b0, b1, b2, b3, b4, b5, b6, b7, b8, p)
dbh |
tree diameter at breast height, in centimeters. |
h |
total tree height, in meters. |
hih |
ratio between the height of the section (hi) and the total height (h) . |
b0, b1, b2, b3, b4, b5, b6, b7, b8 |
model parameters. |
p |
numerical value representing the first inflection point calculated in the segmented model of Max and Burkhart (1976). |
a numeric value indicating the diameter at the section.
Kozak, A. (2004). My last words on taper equations. The Forestry Chronicle, 80(4), 507-515.
library(dplyr) library(minpack.lm) library(timbeR) tree_scaling <- tree_scaling %>% mutate(did = di/dbh, hih = hi/h) kozak <- nlsLM(di ~ taper_kozak(dbh, h, hih, b0, b1, b2, b3, b4, b5, b6, b7, b8, p), data=tree_scaling, start=list(b0=1.00,b1=.97,b2=.03,b3=.49,b4=-0.87,b5=0.50,b6=3.88,b7=0.03,b8=-0.19,p =.1))
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