Haga
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==Handling== | ==Handling== | ||
| − | The handling of the Haga is very similar to the [[Blume-Leiss]] instrument. Same like the Blume-Leiss the Haga hypsometer has different scales for reading [[tree height]] measurements from different predefined fixed distances. The scales for distances of 15, 20, 25 and 30 meter are fixed on a rotating rod and the right scale has to be selected. | + | The handling of the Haga is very similar to the [[Blume-Leiss]] instrument. |
| + | |||
| + | # | ||
| + | 1. Distance measurement | ||
| + | # Place the levelling board 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 | ||
| + | Same like the Blume-Leiss the Haga hypsometer has different scales for reading [[tree height]] measurements from different predefined fixed distances. The scales for distances of 15, 20, 25 and 30 meter are fixed on a rotating rod and the right scale has to be selected. | ||
A button enables the user to lock the pointer needle where the measurement value can be read. | A button enables the user to lock the pointer needle where the measurement value can be read. | ||
Revision as of 09:56, 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 levelling board 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
Same like the Blume-Leiss the Haga hypsometer has different scales for reading tree height measurements from different predefined fixed distances. The scales for distances of 15, 20, 25 and 30 meter are fixed on a rotating rod and the right scale has to be selected.
A button enables the user to lock the pointer needle where the measurement value can be read. Remember the value and measure the crown. 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
Related articles
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