Haga
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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.
Figure 1: Haga altimeter
Using a Haga altimeter
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.
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 –
\[ {h_t} = {h_c} - {h_b} \].
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