Calculate Stability / Change Rate Index (T2)

Measures forest stability using N2 (forest continuity/antiquity) as proxy, following tuto 04 methodology. Falls back to T1 age capped at 100.

Usage

indicator_temporal_change(units, layers = NULL, t1_values = NULL)

Arguments

units

An sf object with forest parcels. May contain pre-computed columns: N2 (forest continuity) or T1 (stand age).

layers

A nemeton_layers object (optional). Not directly used but kept for interface consistency.

t1_values

Numeric vector. Pre-computed T1 age values (same length as nrow(units)). If NULL and units has no T1 column, T2 defaults to 50.

Value

Numeric vector of stability scores (0-100). 100 = very stable (ancient forest), 0 = recent change.

Details

**Primary method**: Use N2 (forest continuity/antiquity) column if present in units. N2 measures continuous forest cover duration, serving as a direct proxy for temporal stability.

**Fallback**: Use T1 stand age capped at 100. Older forests are assumed more stable.

See also

Other temporal-indicators: indicator_temporal_age()

Examples

if (FALSE) { # \dontrun{
library(nemeton)

data(massif_demo_units)
units <- massif_demo_units[1:10, ]

# Compute T1 first, then T2
t1 <- indicator_temporal_age(units, layers = massif_demo_layers())
t2 <- indicator_temporal_change(units, t1_values = t1)
} # }