Factor form for the given volume

Description

This function provide correction for basic volume estimation using cylinder formulation v = DBH^2/4 π H. Factor form is given by taking ratio between real volume and apparent volume.

Usage

1
  ff(volume, dbh, height)

Arguments

volume

volume of a log, can be the output of volume

dbh

diameter at breast height (1.3 meters from floor)

height

commercial height, length of stem or whatever length of log you used in your estimations of cylinder volume

Value

form factor ranging form 0-1 (numeric value)

References

http://wiki.awf.forst.uni-goettingen.de/wiki/index.php/Stem_shape