Question:
The Japanese forester Hirata developed a method for deriving the mean stand height through vertical point sampling and the instrument used for the purpose is _________________.
The Japanese forester Hirata developed a method for deriving the mean stand height through vertical point sampling and the instrument used for the purpose is _________________.
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Hirata = Vertical Point Sampling.
Bitterlich = Horizontal Point Sampling.
Conimeter = Hirata's tool. Wedge Prism = Bitterlich's tool.
Bitterlich = Horizontal Point Sampling.
Conimeter = Hirata's tool. Wedge Prism = Bitterlich's tool.
Updated On: Aug 20, 2026
- Smithies Hypsometer
- Conimeter
- Haga altimeter
- Wedge prism
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This is a factual question about a specific Japanese forest inventory technique used for height estimation.
Step 2: Detailed Explanation:
• Vertical Point Sampling: While Bitterlich developed horizontal point sampling for basal area, the Japanese scientist Hirata proposed vertical point sampling to estimate the average height of a forest stand.
• Principle: It involves counting trees whose heights subtend an angle greater than a fixed vertical angle at the sampling point.
• The Instrument: Hirata developed a simple instrument called the "Conimeter" for this specific purpose. It looks like a small cone or a device with a fixed vertical slot/angle.
• Result: By counting the number of trees $(n)$ that "cross" the conimeter's angle, the mean stand height can be mathematically calculated.
• Other Options: Haga and Smithies are hypsometers for measuring the height of individual trees, not stand-level vertical sampling. Wedge prism is for horizontal sampling.
Step 3: Final Answer:
The instrument is the Conimeter.
This is a factual question about a specific Japanese forest inventory technique used for height estimation.
Step 2: Detailed Explanation:
• Vertical Point Sampling: While Bitterlich developed horizontal point sampling for basal area, the Japanese scientist Hirata proposed vertical point sampling to estimate the average height of a forest stand.
• Principle: It involves counting trees whose heights subtend an angle greater than a fixed vertical angle at the sampling point.
• The Instrument: Hirata developed a simple instrument called the "Conimeter" for this specific purpose. It looks like a small cone or a device with a fixed vertical slot/angle.
• Result: By counting the number of trees $(n)$ that "cross" the conimeter's angle, the mean stand height can be mathematically calculated.
• Other Options: Haga and Smithies are hypsometers for measuring the height of individual trees, not stand-level vertical sampling. Wedge prism is for horizontal sampling.
Step 3: Final Answer:
The instrument is the Conimeter.
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