Shorea assamica / Height
Shorea assamica height from D, Power model (best fit, Table 4)
As printed (Table 1 and Table 4, Power row)
In this library's units, ready to compute (m)
Height = 2.11 * D^0.55D- Diameter at breast height (1.3 m), cm
Selected by the authors as the best-fit model. Fitted on the 70% model-development subset (1009 trees); DBH and height ranges are that subset (Table 3). Only trees with DBH >= 20 cm were recorded. Coefficients are printed to two decimals. The paper also lists Exponential and Gompertz models (Table 4) that were not added: the Exponential b is printed as 0.01 (too coarse to reproduce the fit) and the Gompertz coefficients as printed (a=152.37, b=0.01, c=170.49) do not give a sensible curve.
doi:10.32734/jsi.v8i2.18749 · Open access · copy we read
1009 tree height and diameter datasets were utilized
R2 0.74
- Trees measured
- 1,009
- DBH range
- 20–67 cm
- Height range
- 11–28 m
- R²
- 0.74
- Method
- nonlinear least squares height-diameter model, fitted on 1009 of 1440 trees
- Where
- Tabalong District, South Kalimantan (PT Aya Yayang Indonesia concession, secondary lowland dipterocarp forest)
- 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 = 25 | 12.4 | 12.4 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 40 | 16 | 16 | Computed from the printed form computed from the published form (coefficients as printed) |
| D = 60 | 20.1 | 20.1 | Computed from the printed form computed from the published form (coefficients as printed) |
Related
- Shorea assamica height from D, Linear model (Table 4) · Wirabuana et al. 2025 · DBH
- Shorea assamica height from D, Sigmoid model (Table 4) · Wirabuana et al. 2025 · DBH
- Shorea assamica height from D, Linear model (Table 4) · same paper · Height
- Shorea assamica height from D, Sigmoid model (Table 4) · same paper · Height