Basal area per acre
Basal area per acre is the cross-section area of all the trees on an acre.
$$ba = \sum_{i=1}^{n} 0.005454154 * dbh_i^2 * w_i$$
where ba is the basal are per acre, 0.005454154 is a constant, dbh is the diameter at breast height in inches,
and w is the expansion factor that converts the sample tree to a per acre basis.
$$ba = \sum_{i=1}^{n} 0.00007854 * dbh_i^2 * w_i$$
where ba is the basal are per hectare, 0.00007854 is a constant, dbh is the diameter at breast height in centimeters,
and w is the expansion factor that converts the sample tree to a per hectare basis.
Example
- Imperial Units
- dia = 8,6,8,5,4,6,7 in inches
- weight = 10,10,10,10,10,10,10
- unittype = "imperial"
- Answer = 15.8 sq. feet per acre
- Metric Units
- dia = 8,6,8,5,4,6,7 in centimeters
- weight = 25,25,25,25,25,25,25
- unittype = "metric"
- Answer = 0.56 sq. meters per hectare
Code
This code is stored in my github.com/larsendr site. These are direct links to the raw code.
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