TapeS (version 0.12.1)

azp: Data: Function Parameters to estimate cutting diameter

Description

Parameters for linear regression model of form Az=exp(p1+p2*log(dbh)+p3*(log(dbh)^2)+p4*dbh). Function returns expected cutting diameter according to species and diameter in breast height (dbh). Parameters taken from source code of BDAT.

Usage

azp

Format

A two-dimensional array. rows refer to species, columns to parameter of linear model.

Details

The implemented species are (column=species name): 1=Norway spruce (S-Dt) 2=Norway spruce (N-Dt) 3=Silver fir 4=Scots pine 5=European larch 6=European beech 7=Quercus petraea and robur, possibly rubra

References

Kublin and Scharnagl, 1988.

Examples

data(azp)
dim(azp)
azp[1,] # 1=Norway spruce (S-Dt)
dbh <- 30
exp(azp[1,1]+azp[1,2]*log(dbh)+azp[1,3]*(log(dbh)^2)+azp[1,4]*dbh) # as implemented