N3: Composite Naturalness Index
Source:R/indicators-naturalness.R
indicator_naturalness_composite.RdCalculates a composite naturalness index following tuto 04: N3 = 0.35 * N1 + 0.35 * N2 + 0.15 * (100 - L1) + 0.15 * B3 Falls back to 50 when L1 or B3 are unavailable.