Table 1 Area estimates used to calculate the various NFI indicators; PC_i indicate the plant cover (plant species or group i), CC the canopy cover, and A the forest area (ha), in region j

A_{CC ≤ 100, j}

Total forest area, in all canopy cover conditions (CC ≤ 100%)

\({A}_{P{C}_i>0, CC\le 100,j}\)

Forest area where plant group or species i was present (PC > 0%) in all canopy cover conditions (CC ≤ 100%)

\({A}_{P{C}_i>50, CC\le 100,j}\)

Forest area where plant cover of group or species i was high (PC > 50%) in all canopy cover conditions (CC ≤ 100%)

A_{CC < 50, j}

Forest area where canopy cover was less than 50% (CC < 50%)

\({A}_{PC_i>0, CC<50,j}\)

Forest area where plant group or species i was present (PC > 0%) and canopy cover was less than 50% (CC < 50%)

\({A}_{PC_i>50, CC<50,j}\)

Forest area where plant cover of group or species i was high (PC > 50%) and canopy cover was less than 50% (CC < 50%)