Method

How each equation gets in, how it is checked, and how it stays current.

What gets in

Tree-level equations for biomass (above and below ground, and by component), stem volume, height and root:shoot ratios.
Taken from the paper that published them. Compilations such as GlobAllomeTree only tell us where to look. When we could only read a compilation, the equation is marked from a compilation.
Stand-level (per hectare) models are left out.

The equation exactly as printed, with where it appears (table, equation number, page).
Short quotes for every fact we state: number of trees, fitted ranges, R², correction factors. If the paper doesn't say, we leave it blank. We never infer a number.
Two versions of the formula: the paper's own, in its units, and the library's, in common units (DBH in cm, height in m, wood density in g/cm³, biomass in kg dry mass, volume in m³), with any back-transformation correction factor applied.

Each equation carries at least one worked example. Where the paper prints a predicted value, we use it.
On every build, the library's formula and the paper's formula (after unit conversion) must both reproduce that example within 1%. This catches the most common errors: log base, units, and forgotten correction factors.
Formulas are parsed by a small evaluator that only knows arithmetic and ln, log10, exp and sqrt. Nothing in the data can run code.

Every week a job looks each source's DOI up on Crossref and asks whether the publisher has posted a retraction or correction; a source without a DOI has its link checked instead. Unchanged sources get a new checked date; anything else opens a pull request for review.
The same job searches OpenAlex for newly published allometry papers and lists them as candidates in the repository, so new equations are added from the papers themselves.
Each equation and source shows the date it was last checked.

Prefer an equation fitted on your species and region, inside its fitted DBH range. The calculator warns when you go outside it.
Carbon is shown as biomass × 0.47 (IPCC 2006 Guidelines, Vol. 4, Ch. 4, Table 4.3); CO₂e as carbon × 44/12. Use your standard's own fraction where it differs.
Wood density values: the Global Wood Density Database (Zanne et al. 2009) is the usual source.

Found a wrong number? Email us at info@restorationscope.com. A paper we should add? Send it to us: we do the data entry.

Built and maintained by Restoration Scope, which builds monitoring software for restoration projects. No listing is paid for.