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The Revised Burnley method uses the volume of the tree as a cone (for all trees). You need to first know what the "base value" of 1m3 of tree costs from nurseries. The calculation is done by determining an average value for at least three specimens from different nurseries (using the cone formula to calculate volume).
In the modified method, tree value can be determined using the formula:
VALUE ($) = TREE VOLUME x BASE VALUE x (E) x (FV) x (L).
For consistency, when determining the base value under the modified method, the formula for a cone should be used. The modified method tends to give a lower value for smaller, short-lived or inferior quality specimens.
To calculate cone volume only simply insert 1 in the Base Value box and set other options to "Calculate cone volume only" and the answer is in m3 (metres cubed not $'s)
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