height_crown_base_silva {ForestElementsR} | R Documentation |
Estimate a tree's height to crown base
Description
This function can be used to estimate a tree's height to crown base, given its stem diameter at breast height, its height and its species. This is the height to crown base function implemented in the forest growth simulator SILVA (Pretzsch et al. 2002). Height to crown base in this context is defined as the height where the lowest living branch of the tree's primary crown branches of the stem.
Usage
height_crown_base_silva(species_id, dbh_cm, height_m)
Arguments
species_id |
Vector of species id's following the tum_wwk_short
species coding. Ideally, these species_id's are provided as a
|
dbh_cm |
Vector of tree dbh values in cm (dbh = stem diameter at breast height, i.e. 1.3 m) |
height_m |
Vector of tree height values in m |
Value
An estimate of the tree's height to crown base in m.
References
Pretzsch H, Biber P, Dursky J (2002). “The single tree-based stand simulator SILVA: construction, application and evaluation.” Forest Ecology and Management, 162(1), 3–21. ISSN 0378-1127, doi:10.1016/S0378-1127(02)00047-6.
Examples
# Estimate the height to crown base of a Scots pine with a stem diameter
# at breast height of 45.2 cm and a total height of 29.2 m:
height_crown_base_silva(
species_id = "3", # will be internally converted to tum_wwk_short
dbh_cm = 45.2,
height_m = 29.2
) # 20.9 m (rounded)
# Height to crown base estimate for a European beech with
# the same height and diameter:
height_crown_base_silva(
species_id = "5", # will be internally converted to tum_wwk_short
dbh_cm = 45.2,
height_m = 29.2
) # 15.0 m (rounded)
# Run on vectors
spec <- mm_forest_1_fe_stand_spatial$trees$species_id
h <- mm_forest_1_fe_stand_spatial$trees$height_m
d <- mm_forest_1_fe_stand_spatial$trees$dbh_cm
height_crown_base_silva(spec, d, h)