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Is this calculation the same one used to combine the multiple stems to one value in i-Eco?
Yes. Eco aggregates the basal area of up to 6 stems entered to determine an equivalent DBH for determining estimates. This is done in the code but you can test it by manually entering a tree with multiple stems and then using the formula discussed to enter one tree with an equivalent dbh with the same canopy metrics and it should produce similar estimates for both trees.
A member of the i-Tree Team