Pterocarpus angolensis / Total volume
Total wood volume from DBH and height (Model 3, Table 5)
© i_c_riddell · CC BY · iNaturalistAs printed (Table 5, Model 3)
In this library's units, ready to compute (m³)
Total volume = exp(-8.626 + 2.232 * ln(D) + 0.041 * H)D- Diameter at breast height (1.3 m), cm
H- Total tree height, m
Table 5 caption: 'models with intercept a including the Baskerville correction factor', so the correction is already inside the printed intercept and nothing is added here (no separate CF value is printed). Total over-bark wood volume of the tree including branches and stump. Paper's RSE (0.49 m3 calibration) is on the volume scale, not log scale, so fit.rse is left out; R2 is the printed adjusted R2. Height enters linearly (b2*H), not as ln(H), as printed.
doi:10.1016/j.foreco.2020.118485 · Open access · copy we read
Models for Vtot were established with the data of 69 trees
diameter at breast height (DBH) in the range of 9 to 73 cm
- Trees measured
- 69
- DBH range
- 9–73 cm
- R²
- 0.96
- Method
- Regression on ln scale with Baskerville correction in intercept; adjusted R2
- Where
- Baikiaea-Pterocarpus woodlands of northern Namibia and southern Angola (MAP 480-700 mm)
- Last checked
- 2026-11-02
Shaded: the DBH range the model was fitted on. Other inputs held at the values above.
On every build, the library's form and the paper's own form (in its units) must both give these values within 1%.
| Inputs | Expected | We get | From |
|---|---|---|---|
| D = 20, H = 8 | 0.2 | 0.2 | Computed from the printed form hand-computed from the published form |
| D = 50, H = 14 | 1.97 | 1.97 | Computed from the printed form hand-computed from the published form |
Related
- Total wood volume from DBH (Model 1, Table 5) · De Cauwer et al. 2020 · DBH
- Merchantable stem volume from DBH and height (Model 6, Table 7) · same paper · Stem volume
- Merchantable stem volume from DBH (Model 4, Table 7) · same paper · Stem volume
- Total wood volume from DBH (Model 1, Table 5) · same paper · Total volume