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Table 1 Summary of national forest inventory (NFI) plots and independent validation stands (Val) with known age; characteristics described are number of plots/stands (n), minimum (min), maximum (max), mean, and standard deviation (sd) of age and of mean height, and min, max, and mean of site index (SI), predicted SI (pSI, see next section), and area in hectares (ha)

From: Mapping forest age using National Forest Inventory, airborne laser scanning, and Sentinel-2 data

   Age (years) 95th percentile of ALS first return heights (m) [Field measured arithmetic mean height (m)] SI (pSI) Area (ha)
n min max mean sd min max mean sd min max mean min max mean sum
NFI
 Spruce 2121 3 270 84 45 0.3 [3.8] 32.2 [33.8] 14.5 [15.3] 5.3 [4.6] 6 (8) 26 (23) 13 (15) 0.025 0.025 0.025 53
 Pine 1779 4 287 106 43 0.2 [5.3] 29.3 [28.1] 13.8 [14.2] 4.0 [3.6] 6 (8) 23 (23) 10 (15) 0.025 0.025 0.025 44
 Birch 929 3 223 79 33 1.0 [4.5] 27.1 [26.3] 12.5 [11.8] 4.8 [4.0] 6 (8) 23 (23) 11 (15) 0.025 0.025 0.025 23
 Validation 63 11 89 53 17 6.5 21.3 13.1 3.4 L M H 0.8 10.2 2.7 170