EXP.F: Expansion Factor Formula for Fixed Area and Variable Radius...

In ryanmismith/inventoryfunctions: Forestry Inventory Functions

Expansion Factor Formula for Fixed Area and Variable Radius Plots

Description

This function calculates the expansion factor of a tree for fixed area and variable radius plots.

Usage

EXP.F(DBH, BAF.Area)

Arguments

DBH	Diameter at breast height in cm.
BAF.Area	Enter either the percent of a hectare for fixed radius plots or BAF for variable radius plots.

Details

For fixed area plots, enter the portion of a hectare which was used as the fixed area. If you used 1/5 of a hectare, enter .2.

For variable radius plots enter the BAF that was used.

This function will distinguish between any fixed radius plot smaller than 1 hectare and variable radius plots with any BAF.

Make sure all fixed area plots are represented as a percentage in a value <= 1 (ex: .2, .25, .05, etc.) as any value over 1 will be assumed to be Variable Radius.

This function allows for subplots, fixed area plots, and variable radius plots to be included in the same column or vector. You may want to create a separate factor variable that identifies fixed area, variable radius, regeneration plots or subplots for your analysis, but this function will allow you to have the expansion factor for each tree regardless of sampling method used. This has been designed with the recognition that cruising may often include small fixed area subplots for sampling regeneration while using variable radius plots for trees that are > 10cm.

Value

Returns the number of trees per hectare each measured tree represents.

Examples

# Fixed Area - EXP.F(16, .2)
# Variable Radius - EXP.F(16, 20)

ryanmismith/inventoryfunctions documentation built on Aug. 5, 2022, 2:22 a.m.