Question:medium

The instruments based on trigonometric principles used for tree height measurement are:

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To remember the categories:
- Trigonometric (Angle-based): Abney, Brandis, Haga, Blume-Leiss.
- Geometric (Similar Triangles): Christian, Smythies, Improvised Caliper.
Trigonometric instruments require measuring the horizontal distance to the tree to calculate height.

Updated On: Jul 28, 2026

Brandis hypsometer, Abney's level and Haga altimeter
Abney's level, Haga altimeter and Improvised calliper
Christian hypsometer, Improvised calliper and Haga altimeter
Brandis hypsometer and Christian hypsometer

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The Correct Option is A

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