# Chir pine height from D, linear (M1)

Height equation for Pinus roxburghii, Nepal, from Upadhyay & Khadka 2024. Listed on Tree Allometrics, a free library of tree allometric equations, each quoted from the source that published it.

## Equation

As printed in Upadhyay & Khadka 2024 (Table 4, M1):

> height = 0.466 *dbh + 3.623

Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#equation

In this library's units, ready to compute (height in m):

```
Height = 0.466 * D + 3.623
```

Inputs: D = Diameter at breast height (1.3 m) (cm).
The source's own form: 0.466 * DBH + 3.623, with DBH in cm; output in m.
Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#canonical

## What it covers

- Output: Height, m
- Taxon: Pinus roxburghii (species), family Pinaceae; conifer
- Where: Nepal, Forest Resource Assessment 2018 plots. Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#where
- Biomes: subtropical, montane
- Stand: natural
- R²: 0.712. Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#r2
- Method: simple linear regression. Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#method
- Verification: read in the original source
- Last checked: 2026-11-02. Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#checked_at

A missing fit statistic is one the source doesn't state, or that we haven't recorded; it is never estimated. Outside the stated DBH range or region, the equation is an extrapolation.

## Source

Upadhyay, J., & Khadka, S. (2024). Modelling height-diameter relationship of Pinus roxburghii in Nepal. American Journal of Biological and Environmental Statistics, 10(3), 49–59.

- DOI: https://doi.org/10.11648/j.ajbes.20241003.12
- Access: open access
- Copy we read: http://article.sciencepg.com/pdf/j.ajbes.20241003.12
- Every equation from this source: https://treeallometry.org/sources/upadhyay-2024/
- Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#source

## The facts, in the source's words

**Equation** (Table 4, M1):

> height = 0.466 *dbh + 3.623

Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#equation

**Our note:** r2 is the adjusted R2 as printed in Table 6 (RMSE 3.718). Fitted on the 80% training split of the FRA 2018 sample; the paper's n is ambiguous (610 'sample plots' vs 610 trees in Table 3), so n_trees and ranges are left out. Table 6 coefficient columns differ from Table 4; Table 4 (printed formulas, consistent with Table 3 class means) is used.

## Checks this equation passes

On every build, the library's form and the source's own form (in its units) must both give these values within 1%.

| Inputs | Expected | We get | From |
| --- | --- | --- | --- |
| D = 10 | 8.28 | 8.28 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 25 | 15.3 | 15.3 | Computed from the printed form: computed from the published form (coefficients as printed) |
| D = 50 | 26.9 | 26.9 | Computed from the printed form: computed from the published form (coefficients as printed) |

Cite: https://treeallometry.org/equations/upadhyay-2024-h-linear/#checks

## How to cite

Cite the source for the equation: Upadhyay, J., & Khadka, S. (2024). Modelling height-diameter relationship of Pinus roxburghii in Nepal. American Journal of Biological and Environmental Statistics, 10(3), 49–59. https://doi.org/10.11648/j.ajbes.20241003.12

Cite this page for the record and checks: Tree Allometrics (Restoration Scope), "Chir pine height from D, linear (M1)", checked 2026-11-02, https://treeallometry.org/equations/upadhyay-2024-h-linear/. Data CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Quotes are the authors' words.

Data for this equation: https://treeallometry.org/data/equations/upadhyay-2024-h-linear.json
Report a problem: email info@restorationscope.com with the equation id (upadhyay-2024-h-linear) and where the right value appears.