Clinomaster

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General description

The Clinomaster (figure 1) is a device that is used to measure slope and tree heights within fixed distances (15m, 20m) to the tree using the trigonometric principle. Therefore the angles between the actor and the tree are measured. The Clinomaster has an optical rangefinder to measure distances (15m, 20m (figure 2)) optically and a sighting viewer to look on the height scales.

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  Figure 1: Portrait

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  Figure 2: Scales

Handling

Height measurement

1. sight the object (tree) and focus parallel with both eyes open
   • the hairline can be seen by optical illusion
2. remember the measurment value and measure the tree crown
3. difference between the crown height and the bottom value is the tree height:\[ {h_t} = {h_c} - {h_b} \]

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  Figure 3: Live view trunk bottom measurement]]

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  Figure 4: Live view crown measurement]]

Advantages	Disadvantages
slope correction implemented	measurement value need to be remembered
optical distance measurement	fixed distances to the tree (could be difficult in closed forest stands)
independence of power sources (no batteries needed)	in dark forest stand optical measurement is difficult, no digital storage of measurement results available.

Applications

• Height measurement

Related articles

• The trigonometric principle
• Bitterlich sampling

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