Haga
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# | # | ||
1. Distance measurement | 1. Distance measurement | ||
| − | # Place the | + | # Place the reference tape at the tree. |
# Determine an optimal distance to the tree by checking the view field to tree bottom and top within the forest stand - preferably 15, 20, 25 or 30m. | # Determine an optimal distance to the tree by checking the view field to tree bottom and top within the forest stand - preferably 15, 20, 25 or 30m. | ||
# Take place at the estimated distance to the tree | # Take place at the estimated distance to the tree | ||
| − | |||
| − | + | 2. Height measurement | |
| − | + | # Select the corresponding height scale by turning the adjustment disk | |
| − | The difference between the measurements will be tree height: | + | # Sight tree bottom, lock the pointer needle and remember the value |
| + | # Sight tree crown, lock the pointer needle and remember the value | ||
| + | # The difference between the measurements will be tree height: | ||
:<math> {h_t} = {h_c} - {h_b} </math>. | :<math> {h_t} = {h_c} - {h_b} </math>. | ||
Revision as of 09:03, 28 June 2012
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Contents |
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 and slope in percent. The suitable scale can be selected by rotating the adjustment disk at the front of the device. A reference tape can be installed at the tree to determine the distance optically.
Figure 1: Haga altimeter
Using a Haga altimeter
Handling
The handling of the Haga is very similar to the Blume-Leiss instrument.
1. Distance measurement
- Place the reference tape at the tree.
- Determine an optimal distance to the tree by checking the view field to tree bottom and top within the forest stand - preferably 15, 20, 25 or 30m.
- Take place at the estimated distance to the tree
2. Height measurement
- Select the corresponding height scale by turning the adjustment disk
- Sight tree bottom, lock the pointer needle and remember the value
- Sight tree crown, lock the pointer needle and remember the value
- The difference between the measurements will be tree height:
\[ {h_t} = {h_c} - {h_b} \].
Figure 2: Live view measuring tree bottom
Figure 3: Live view measuring tree crown
Applications
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