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sci.leaf-area-index-ellipsoidal Calculator
Calculates Leaf Area Index from gap fraction measurements using the Miller integral: LAI = 2∫₀^(π/2) −ln(P(θ))sin(θ)cos(θ)dθ for an ellipsoidal leaf angle distribution. LAI of dense tropical forest canopy: 5–8; temperate crops at peak: 3–6 — LAI drives canopy light interception and transpiration.
Inputs
Transmitted Par
Reference formula or conversion factor shown for context.
Above Canopy Par
Reference formula or conversion factor shown for context.
K Extinction
Reference formula or conversion factor shown for context.
Results
leaf area index LAI (m²/m²)
A normalised score comparing the result to a reference baseline.
fraction absorbed PAR (fAPAR)
Sample size or count used in the calculation.
canopy transmittance T/I₀
Sample size or count used in the calculation.
Beer-Lambert: T = I₀·exp(-k·LAI)
Reference formula or conversion factor shown for context.
LAI benchmarks
Reference value for comparison — the industry standard, historical average, or target that this result is measured against.