calcAgeClassDistribution

Forest area in 15 age classes. With dataset = "GFAD" (default) the distribution comes directly from the Global Forest Age Dataset (GFAD v1.1, Poulter et al. 2019): per-cell class fractions times cell area, summed over the four forest types. With dataset = "GAMI" the *age distribution* comes from GAMI v2.1 (Besnard et al. 2024) while the per-cell forest *area* is taken from the GFAD product. GAMI supplies only the within-forest age shares (12 classes, summing to 1); keeping the GFAD forest-area map as the spatial weight conserves each cell's total forest area and isolates the pure age-structure change. GAMI's 12 twenty-year classes are mapped onto the 15 GFAD ten-year classes (each split 50/50 into two adjacent classes; all classes >=140 yr, i.e. GAMI `140-160 ... >299`, collapse into `class15`, the mature bin routed to `acx` in module 28). Where GAMI reports no forest but GFAD does, the GFAD age shape is retained (area-conserving).

Usage

calcAgeClassDistribution(
  cells = "lpjcell",
  dataset = "GFAD",
  gamiYear = "y2010"
)

Arguments

cells

lpjcell for 67420 cells

dataset

"GFAD" (default) or "GAMI"

gamiYear

GAMI reference year when dataset = "GAMI": "y2010" (default, matches the GFAD vintage) or "y2020"

Value

magpie object in cluster resolution

Author

Abhijeet Mishra, Felicitas Beier, Florian Humpenoeder

Examples

if (FALSE) { # \dontrun{
calcOutput("AgeClassDistribution", aggregate = FALSE)
calcOutput("AgeClassDistribution", dataset = "GAMI", aggregate = FALSE)
} # }