Compute variables for structural stage look up and stand composition look up

calc_forest_age_class(vri_bem, most_recent_harvest_year)

Arguments

vri_bem: sf object that represent VRI (vegetation resource inventory) features
most_recent_harvest_year: integer that represent the most recent harvest year

Value

sf object VRI-BEM with new attributes: PROJ_AGE_1, VRI_AGE_CL_STS and VRI_AGE_CL_STD

Details

PROJ_AGE_1 is calculated as the difference in years between the harvest date and the most recent harvest year Based on the the age the VRI_AGE_CL_STS are defined as below:

PROJ_AGE_1	VRI_AGE_CL_STS
< 0	-1
0-3	2
4-10	7
11-30	20
31-40	35
41-60	50
61-80	70
81-140	125
141-249	195
> 249	301

Based on the the age the VRI_AGE_CL_STD are defined as below:

PROJ_AGE_1	VRI_AGE_CL_STD
< 0	-1
0-15	15
16-30	30
31-50	50
51-80	80
> 80	9999