Wedge prism
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==Handling== | ==Handling== | ||
| − | # Select the point for [[Bitterlich sampling|angle count sample]] | + | # Select the point for [[Bitterlich sampling|angle count sample]], |
| − | # Select starting point (tree) for the sample | + | # Select starting point (tree) for the sample, |
| − | # Move around the prism | + | # Move around the prism in a 360° sweep and count the trees included in the sample till starting point is reached, |
| + | # Multiply the counted number with the respective [[Bitterlich_sampling#Choice_of_basal_area_factor|basal area factor]] of the prism (the result is an estimate of basal area in m² per ha) | ||
<gallery widths=300px heights=300px> | <gallery widths=300px heights=300px> | ||
Revision as of 19:53, 4 July 2012
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This section is still under construction! This article was last modified on 07/4/2012. If you have comments please use the Discussion page or contribute to the article! |
Contents |
General description
The wedge prism is a small honed glass plate that is used to make an angle count sample. You can estimate basal area factors of ½, 1, 2 or 4. The observer can do an angle count sample while he moves around the prism – and the prism is still located at the centre point of the plot.
Handling
- Select the point for angle count sample,
- Select starting point (tree) for the sample,
- Move around the prism in a 360° sweep and count the trees included in the sample till starting point is reached,
- Multiply the counted number with the respective basal area factor of the prism (the result is an estimate of basal area in m² per ha)
Tree is included in the sample
Tree is not included in the sample
| Advantages | Disadvantages |
|---|---|
| independence of power sources (no batteries needed) | no digital storage of measurement results available. |
