Wedge prism
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==General description== | ==General description== | ||
The wedge prism is a small honed glass plate that is used to make an [[Bitterlich sampling|angle count sample]]. You can estimate [[basal area]] with [[Bitterlich_sampling#Choice_of_basal_area_factor|basal area factors]] of ½, 1, 2 or 4. Each prism has a constant factor. | The wedge prism is a small honed glass plate that is used to make an [[Bitterlich sampling|angle count sample]]. You can estimate [[basal area]] with [[Bitterlich_sampling#Choice_of_basal_area_factor|basal area factors]] of ½, 1, 2 or 4. Each prism has a constant factor. | ||
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<gallery widths=300px heights=300px> | <gallery widths=300px heights=300px> | ||
file:Wedge-prism_IN.jpg|Tree is included in the sample | file:Wedge-prism_IN.jpg|Tree is included in the sample | ||
| − | file: | + | file:Wedge-prism02_OUT.jpg|Tree is not included in the sample |
</gallery> | </gallery> | ||
{| class="wikitable" | {| class="wikitable" | ||
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==Related articles== | ==Related articles== | ||
* [[Bitterlich sampling]] | * [[Bitterlich sampling]] | ||
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[[category:Measurement devices]] | [[category:Measurement devices]] | ||
Latest revision as of 15:05, 5 November 2013
Contents |
[edit] 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 with basal area factors of ½, 1, 2 or 4. Each prism has a constant factor. The observer can do an angle count sample moving around the prism – while the prism is located at the sample point.
[edit] 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. |
[edit] Applications
[edit] Related articles
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