Carbon Credits (Carbon Farming Initiative—Reforestation and Afforestation 2.0) Methodology Determination 2015
122Calculating the variance of weighted residuals for biomass sample trees and test trees
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122 Calculating the variance of weighted residuals for biomass sample trees and test trees
(1) The variance of weighted residuals for a set of biomass sample trees or test trees must be calculated in accordance with Equations 32a to 32c.
(2) The variance of weighted residuals for:
(a) a set of biomass sample trees that have been assessed as part of the process for developing an allometric function; or
(b) a set of test trees that have been assessed as part of the process for validating an allometric function;
is to be calculated using the following formula:
| | Equation 32a |
| = | variance of weighted residuals for biomass sample trees ( or for test trees (. |
|---|---|
| = | weighted residual in kilograms (kg) for tree , calculated in accordance with Equation 32b. |
| = | a biomass sample tree or a test tree. |
| = | the number of biomass sample trees () or test trees (), as a whole number. |
| = | the number of parameters in the allometric function, as a whole number. |
(3) The weighted residual for a biomass sample tree or a test tree is to be calculated using the following formula:
| | Equation 32b |
| = | weighted residual in kilograms (kg) for tree . |
|---|---|
| = | a biomass sample tree or a test tree. |
| = | biomass in kilograms (kg) for tree measured through destructive sampling. |
| = | predicted biomass in kilograms (kg) for tree calculated from the allometric function. |
| = | weighting factor applied to tree , calculated in accordance with Equation 32c. |
(4) The weighting factor applied to a biomass sample tree or test tree is to be calculated using the following formula, and expressed as a dimensionless number:
| | Equation 32c |
| = | weighting factor applied to tree . |
|---|---|
| = | basal area of tree in square metres (m2). |