Question:
In ______________________, a series of sampling points are selected randomly or systematically distributed over the entire area to be inventoried.
In ______________________, a series of sampling points are selected randomly or systematically distributed over the entire area to be inventoried.
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Horizontal Point Sampling = Bitterlich's Method. It uses a wedge prism and "points" instead of "plots" to save time in the field.
Updated On: Aug 20, 2026
- Stratified Random Sampling
- Multistage sampling
- Sequential sampling
- Horizontal point sampling
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question describes a specific forest inventory method that relies on points rather than fixed-area plots.
Step 2: Detailed Explanation:
• Definition: Horizontal Point Sampling (also known as Bitterlich sampling or variable plot sampling) is a method where trees are selected based on their size relative to a fixed angle projected from a sampling point.
• Process: Instead of measuring boundaries of a $0.1$ ha plot, the forester stands at a "point" and rotates $360^{\circ}$ using a wedge prism or a relascope.
• Selection: Trees whose diameter appears larger than the instrument's angle are "counted." The number of trees counted is directly proportional to the Basal Area per hectare.
• Distribution: As described in the question, these "points" are distributed across the entire forest area to get an accurate estimate of the total volume or basal area.
• Advantage: It is much faster than traditional plot-based inventory because no tape measurements of distances to trees or plot boundaries are required.
Step 3: Final Answer:
The method is Horizontal point sampling.
The question describes a specific forest inventory method that relies on points rather than fixed-area plots.
Step 2: Detailed Explanation:
• Definition: Horizontal Point Sampling (also known as Bitterlich sampling or variable plot sampling) is a method where trees are selected based on their size relative to a fixed angle projected from a sampling point.
• Process: Instead of measuring boundaries of a $0.1$ ha plot, the forester stands at a "point" and rotates $360^{\circ}$ using a wedge prism or a relascope.
• Selection: Trees whose diameter appears larger than the instrument's angle are "counted." The number of trees counted is directly proportional to the Basal Area per hectare.
• Distribution: As described in the question, these "points" are distributed across the entire forest area to get an accurate estimate of the total volume or basal area.
• Advantage: It is much faster than traditional plot-based inventory because no tape measurements of distances to trees or plot boundaries are required.
Step 3: Final Answer:
The method is Horizontal point sampling.
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