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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