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Function	Method	Outputs	Inputs	Main formula (generic form)	Notes / Context
Converting module
c150_c130()	Convert c150 to c130 or Convert c130 to c150	c150 c130	c130 c150	c130=a⋅c150+b c150=(c130-b)/a	The function computes c150 or c130 depending on data availabity
add_c130_dbh()	Add or compute c130 and dbh	c130 dbh	dbh c130	dbh = c130 / π c130 = dbh · π	Auto-fills missing c130 or dbh.
General & widely applicable volume models
dagnelie_vc22_1()	Dagnelie single entry	vc22	c130	vc22 = a + b·c130 + c·c130² + d·c130³	Simplest Dagnelie taper model, relies only on circumference.
dagnelie_vc22_1g()	Dagnelie graduaded	vc22	c130 hdom	vc22 = a + b·c130 + c·c130² + d·c130³ + e·hdom + f·c130²·hdom	Improves accuracy in pure, even-aged stands by adding dominant height.
dagnelie_vc22_2()	Dagnelie 2 entry	vc22	c130 htot	vc22 = a + b·c130 + c·c130² + d·c130³ + e·htot + f·c130²·htot	Most precise Dagnelie model; recommended mainly for high-value trees due to height measurement cost.
dagnelie_br()	Dagnelie – Branch volume	vbr	c130	vbr = a + b·c130 + c·c130² + d·c130³	Estimates branch volume from circumference only.
vallet_vta()	Vallet - Volume above ground	vta	c130 htot	form = (a + b·c130 + c·c130/htot)·(1 + d·c130²) vta = form · (π / 40000) · c130² · htot	Explicitly models stem form factor; primarily for French species.
vallet_vc22()	Vallet merchantising volume	vc22	dbh htot	vc22 = a·htot/dbh + (b + c·dbh)·π·dbh²·htot / 40000	Geometrically adjusted; species-specific coefficients reflecting stem structure.
Context-specific methods
algan_vta_vc22()	Algan - volume computer(2006)	vta vc22	dbh htot	vta = 0.40 · (dbh/100)² · htot vc22 = 0.33 · (dbh/100)² · htot	Simplified geometric estimator; mainly used in France for Abies alba.
bouvard_vta()	Bouvard - Volume above ground	vta	dbh htot	vta = 0.50 · (dbh/100)² · htot	Specific to oaks (Quercus sp.), especially in coppice-with-standards regimes.
rondeux_vc22_vtot()	Rondeux / Pauwels et al. (2022)	vtot vc22	c130 htot	vtot = a · c130² · htot vc22 = a + b · c130² · htot	Wallonia-specific; calibrated for larch (Larix sp.) in small-circumference trees (first thinnings).
Biomass / carbon computer
biomass_calc() – CNPF pathway	CNPF / France Valley	bag bbg btot carbon CO₂	vc22	bag = vc22 · feb · density bbg = exp(−a + b·ln(bag) + c) btot = bag + bbg C = 0.475 · btot	feb = 1.30 (conifers) feb = 1.56 (broadleaves) carbon and CO₂ derived from total biomass.
biomass_calc() – Vallet pathway	Follow Vallet et al. (2006)	bag bbg btot carbon CO₂	vallet_vta	bag = vta · density bbg = exp(−a + b·ln(bag) + c) btot = bag + bbg	Used when vallet_vta is available root biomass is implicitly included.
Plot module
plot_by_class()	Plot histogram by class of c130	vc22 vta btot			Class width can be adjusted by the breaks input in the function

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