barkNOR: Bark model for spruce, pine, and birch for Norway

In JohannesRahlf/taperNO:

Bark model for spruce, pine, and birch for Norway

Description

The bark models are based on Hannrup B. 2004. Funktioner för skattning av barkens tjocklek hos tall och gran vid avverkning med skördare. (Functions for prediction of bark thickness of Norway spruce and Scots pine at CTL-harvesting). Arbetsrapport 575. Skogforsk, Uppsala. via Stängle et al. 2017. Comparison of models for estimating bark thickness of Picea abies in southwest Germany: the role of tree, stand, and environmental factors. Ann For Sci. 74(1):16.

Usage

barkNOR(d, h, dbh, h_top, sp = "spruce")

Arguments

d	diameter (cm).
h	height above ground (m).
dbh	diameter at breast height, 1.3 m above ground (cm).
h_top	tree height above ground (m).
sp	species ('spruce','pine' or 'birch'; 1:3)

Value

double bark thickness (cm) at height h with diameter d.

Examples

barkNOR(d=30, h=1,dbh=25,h_top=30,sp="pine")

taper<-taperNOR(h=(0:300)/10,dbh=25,h_top=30,sp="pine")
bark<-barkNOR(d=taper, h=(0:300)/10,dbh=25,h_top=30,sp="pine")
plot((0:300)/10,taper,type="l",col="brown",xlab="height (m)",ylab="taper/bark (cm)")
points((0:300)/10,taper-bark/10,type="l",col="green")
legend("topright",legend = c("taper","bark"),fill=c("brown","green"),border=NA)

points((0:300)/10,bark,type="l",ylab="bark (cm)",xlab="height (m)")

JohannesRahlf/taperNO documentation built on Feb. 17, 2025, 8:02 p.m.