Table 2 Characteristics of the fitted models for spruce. (SI: site index)
From: Mapping forest age using National Forest Inventory, airborne laser scanning, and Sentinel-2 data
SI 6 | SI 8 | SI 11 | SI 14 | SI 17 | SI 20 | SI 23 | SI 26 | All SI | |
|---|---|---|---|---|---|---|---|---|---|
Norway spruce | |||||||||
R2 | 0.46 | 0.60 | 0.75 | 0.79 | 0.79 | 0.84 | 0.91 | 0.96 | – |
RMSE (Years) | 30.5 | 31.2 | 23.3 | 15.4 | 10.8 | 9.3 | 7.0 | 2.9 | 21.2 |
RMSE (%) | 21.8 | 25.8 | 25.5 | 22.8 | 18.6 | 17.5 | 14.2 | 6.4 | 25.1 |
MD (Years) | 2.1 | 2.6 | 1.8 | 0.5 | −0.2 | −0.4 | −0.7 | −1.0 | 1.0 |
MD (%) | 1.5 | 2.2 | 1.9 | 0.8 | −0.3 | −0.8 | −1.5 | −2.2 | 1.2 |