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 |