69Updating pre‑existing stratum specific functions or CFI functions

69 Updating pre‑existing stratum specific functions or CFI functions

(1) This section applies where the project proponent wishes to update or extend the allometric domain of a stratum specific function (the original function) by adding new data to the dataset used to produce the original function.

(2) This section also applies where the project proponent wishes to update or extend the domain of a CFI function (the original function) that:

(a) is stratum specific; and

(b) was based on a dataset that was produced by creating size classes and selecting equal numbers of sample trees from each class.

(3) The updating or extension of the original function must be done in conjunction with a full inventory or a PSP assessment.

Selection of domain and class sizes

(4) The project proponent must collect predictor measures from all live project trees of the relevant tree type from within the TSPs or PSPs, as appropriate (the function trees).

(5) The domain for the updated function must be set by using the size classes in the original data set and:

(a) removing any size classes that are now outside the required domain; and

(b) adding any size classes required to extend the domain, defined on the same basis as the original size classes.

Selection and assessment of biomass sample trees

(6) If any size classes are being added to the domain, N function trees must be selected from each size class for assessment as biomass sample trees by the method set out in subsections 68(8) and (11), where N is the number of trees that were drawn from each size class to produce the original function.

(7) If the proponent wishes to update the original function within its current domain, further function trees must be selected for assessment as biomass sample trees by drawing an equal number from each size class by the method set out in subsections 68(8) and (11).

(8) All the biomass sample trees must be assessed in accordance with Subdivision 14.

Updating the original function

(9) The data collected from the biomass sample trees must be combined with the allometric dataset used to develop the original function, and the function recalculated in accordance with Subdivision 12.

(10) If the minimum regression fit requirements specified in subsection 64(2) are met, the updated stratum specific function or CFI function may be applied within the stratum from which the allometric dataset was derived.

(11) If the minimum regression fit requirements specified in subsection 64(2) are not met, the project proponent may repeat the method in this section adding further biomass sample trees from each size class in accordance with subsection (6) and subsection (7).