nsur | R Documentation |
evaluation of the component biomass functions fit by nonlinear seemingly unrelated regression (NSUR) to estimate absolute or relative component mass
nsur(spp, dbh, ht, sth, d03, kl)
spp |
vector of species code for biomass component function of interval
[1;8]; see |
dbh |
vector of diameter in breast height; in centimeter |
ht |
vector of tree heights, in meter |
sth |
vector of stump heights, in meter |
d03 |
vector if diameter in 30% of tree height, in centimeter |
kl |
vector of green crown base, in meter |
function to calculate component biomass; functions fitted using
same methodology as in Vonderach et al. (2018) with slightly updated
parameters as in Vonderach and Kändler (2021); species mapping as in
TapeS::BaMap(, type=7)
a numeric matrix holding component biomass
Vonderach, C., G. Kändler and C. F. Dormann (2018). "Consistent set of additive biomass functions for eight tree species in Germany fit by nonlinear seemingly unrelated regression." Annals of Forest Science 75(2): 49. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1007/s13595-018-0728-4")}
Vonderach, C. and G. Kändler (2021). Neuentwicklung von Schaftkurven- und Biomassemodellen für die Bundeswaldinventur auf Basis des TapeR-Pakets - Abschlussbericht zum Projekt BWI-TapeR. Freiburg: 150p.
nsur(spp = c(1, 6),
dbh = c(30, 30),
ht = c(25, 27),
sth = c(0.25, 0.27),
d03 = c(27, 27),
kl = .7*c(25, 27))
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