v_red_harvest_ubark {ForestElementsR} | R Documentation |
Reduce a Given standing Volume Over Bark to Harvested Volume Under Bark
Description
Many tree volume functions (like v_gri
) calculate wood volumes
defined as standing and over bark. Practictioners often prefer to work with
volumes where the harvest losses and the bark volume have been substracted.
Given an over bark standing volume, this function uses species specific
reduction factors in order to obtain harvested volume under bark. The
reduction factors are taken from
(BayMinELF 1990); they relate to the
species coding fe_species_tum_wwk_short
or, alternatively
fe_species_bavrn_state_short
.
Usage
v_red_harvest_ubark(species_id, v_orig_m3)
Arguments
species_id |
Vector of species id's. Ideally, these species_id's are
provided as a |
v_orig_m3 |
Vector of wood volumes (m³) defined as standing over bark.
If |
Value
A vector of the reduced volumes defined as harveest
References
BayMinELF (1990). Hilfstafeln für die Forsteinrichtung. Zusammengestellt für den Gebrauch in der Bayerischen Staatsforstverwaltung. Bayerisches Staatsministerium für Ernährung Landwirtschaft und Forsten.
Examples
# Take all species groups of tum_wwk_short and a standing volume of 1 m³
# over bark
species_id <- fe_species_tum_wwk_short(1:10)
v_red_harvest_ubark(species_id, 1)