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. <gallery

Figure 2: Live view measuring tree bottom

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Remember the value and measure the crown.

Figure 2: Live view measuring tree 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.

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