taper {dyntaper}

Tree taper (or profile) equation.

Description

Returns the diameter or cross-sectional area at one or more hight levels.

Usage

taper(h, H, D, b, bh, area = FALSE)

Arguments

h

Height level(s), possibly a vector.

H

Tree total height.

D

Tree diameter at breast height (dbh).

b

Vector with the 5 parameters.

bh

Breast height. Typically 1.2, 1.3 or 1.4 m, or 4.5 ft.

area

If TRUE, returns cross-sectional areas, otherwise returns diameters. Default is FALSE.

Value

Diameter(s) at level(s) 'h' if 'area' is FALSE, otherwise cross-sectional area(s).

Note

Diameters or areas are either all outside bark, or all inside bark. A dbh outside bark can be used with an inside-bark taper equation through a substitution D -> k * D, where k is an outside to inside bark conversion factor.

Examples

  curve(taper(x, 32, 0.956*24, c(2.569, 0, 1.042, 0.3012, -1), 1.3), 0, 32)