Wedge prism
From AWF-Wiki
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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 factors of ½, 1, 2 or 4. | 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 factors of ½, 1, 2 or 4. | ||
The observer can do an [[Bitterlich sampling|angle count sample]] while he moves around the prism – and the prism is still located at the centre point of the plot. | The observer can do an [[Bitterlich sampling|angle count sample]] while he moves around the prism – and the prism is still located at the centre point of the plot. | ||
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| + | ==Handling== | ||
| + | # Select the point for [[Angle count sample]]. | ||
| + | # Select starting point (tree) for the sample. | ||
| + | # Move around the prism counting the trees included in the sample till starting point is reached. | ||
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<gallery width=400pxheight=400px> | <gallery width=400pxheight=400px> | ||
file:wedge_prism1.jpg|Tree is included in the sample | file:wedge_prism1.jpg|Tree is included in the sample | ||
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* [[Bitterlich sampling]] | * [[Bitterlich sampling]] | ||
| − | [[category:]] | + | [[category:Measurement devices]] |
Revision as of 11:07, 28 June 2012
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sorry: |
This section is still under construction! This article was last modified on 06/28/2012. 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 counting the trees included in the sample till starting point is reached.
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. |
