Haga
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==Handling== | ==Handling== | ||
| − | The handling of the Haga is similar to the [[Blume Leiss]]. A button enables the actor to lock the needle where the measurement value can be read. | + | The handling of the Haga is similar to the [[Blume Leiss]]. A button enables the actor to lock the needle where the measurement value can be read. |
| + | <gallery | ||
[[file: haga02_measurement-bottom.jpg|thumb|300px|Figure 2: Live view measuring tree bottom]]. | [[file: haga02_measurement-bottom.jpg|thumb|300px|Figure 2: Live view measuring tree bottom]]. | ||
Remember the value and measure the crown. | Remember the value and measure the crown. | ||
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:<math> {h_t} = {h_c} - {h_b} </math>. | :<math> {h_t} = {h_c} - {h_b} </math>. | ||
| − | + | ||
| + | The difference between the measurements will be tree height – | ||
| + | :<math> {h_t} = {h_c} - {h_b} </math>. | ||
| + | {| class="wikitable" | ||
| + | !Advantages | ||
| + | !Disadvantages | ||
| + | |- | ||
| + | |slope correction implemented| - measured values need to be remembered, because no second needle implemented | ||
| + | |- | ||
| + | |optical distance measurement | ||
| + | |fixed distances to the tree (could be difficult in closed forest stands) | ||
| + | |- | ||
| + | |independence of power sources (no batteries needed) | ||
| + | |no zooming for the sight field available, in dark forest stand optical measurement is difficult, no digital storage of measurement results available. | ||
| + | |} | ||
[[Category:]] | [[Category:]] | ||
Revision as of 11:10, 12 June 2012
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This section is still under construction! This article was last modified on 06/12/2012. If you have comments please use the Discussion page or contribute to the article! |
General description
Haga is a device to measure tree heights within distances of 15, 20, 25 and 30m to the tree by the trigonometric principle.The distance to three can optically be determined. Additionally there is a scale for slope measurements in % implemented. Therefore a levelling board is available.
Handling
The handling of the Haga is similar to the Blume Leiss. A button enables the actor to lock the needle where the measurement value can be read. <gallery
Remember the value and measure the crown.
The difference between the measurements will be tree height – \[ {h_t} = {h_c} - {h_b} \].
The difference between the measurements will be tree height –
\[ {h_t} = {h_c} - {h_b} \].
| Advantages | Disadvantages |
|---|---|
| - measured values need to be remembered, because no second needle implemented | |
| optical distance measurement | fixed distances to the tree (could be difficult in closed forest stands) |
| independence of power sources (no batteries needed) | no zooming for the sight field available, in dark forest stand optical measurement is difficult, no digital storage of measurement results available. |
[[Category:]]
