Table 4 Accuracy of T-LiDAR measurements when compared to intensive field measurements for the three studies on the left and to Relaskop measurements for Strahler et al. (2008), on the right. For reasons of clarity and consistency of results, some values have been recalculated from the available values
Study | Hopkinson et al. 2004 | Wezyk et al. 2007 | Tansey et al. 2009 | Strahler et al. 2008 | |||
|---|---|---|---|---|---|---|---|
LiDAR type | OPTECH Inc. ILRIS-3D | FARO LS 800 HE80 | RIEGL LMS-Z420i | Echidna® prototype | |||
Software | InnovMetric Polyworks | Faro Scene / Terrasolid | InnovMetric Polyworks | Specific algorithms | |||
Scanning method | Multiple scans | Multiple scans | Multiple scans | Single scan | |||
Forest type (density in stem/ha) | Coniferous (661) | Deciduous (465) | Coniferous | Deciduous | Coniferous (1000) | Coniferous | Deciduous |
Plot area | 35 m x 35 m | 35 m x 35 m | 500 m² | 500 m² | 23 m x 21 m | 50 m radius | 50 m radius |
Tree detection rate (%) | 95 | 100 | 96.6 | 100 | 100 | 92.3 | 87.7 |
DBH mean difference (cm) | -1 | +1 | ±1 | ±1 | ±1.9 | -2 | +3 |
Stem density mean difference (%) | 0 | +3.2 | - | - | +3.1 | -21 | -1.2 |
Basal area mean difference (%) | -0.6 | -0.7 | +0.26 | +1.63 | Acceptable | -7.7 | -1.7 |
Tree height mean difference (m) | +1.5 | +1.5 | +0.44 | +0.35 | - | - | - |