Module 4 Topic 9

Summary

This video explains how to determine the radius for different sized radial plots, which are essential for forest survey work. Using the area formula (Area = πR²), the script demonstrates how to calculate the radius for various plot sizes, such as one third, one fourth, and one fifth of an acre. For example, a one third-acre plot has a radius of 68 feet, while a one fourth-acre plot has a radius of 59 feet. The video encourages keeping a guide for quick reference when working in the field to easily calculate radii based on square footage.

Takeaways

• 😀 Radial plots are circular and cover a specific area in square feet, depending on their size.
• 😀 One acre equals 43,560 square feet, which is essential for calculating smaller plot sizes.
• 😀 A one-third acre plot contains 14,520 square feet.
• 😀 A one-fourth acre plot contains 10,890 square feet.
• 😀 A one-fifth acre plot contains 8,712 square feet.
• 😀 Radial survey plots can vary in size and are not limited to these specific examples.
• 😀 To calculate the radius of a radial plot, use the area formula: Area = πr².
• 😀 For a one-third acre plot, the radius is approximately 68 feet.
• 😀 For a one-fourth acre plot, the radius is approximately 59 feet.
• 😀 For a one-fifth acre plot, the radius is approximately 53 feet.
• 😀 It's useful to have a quick-reference guide for plot sizes and their corresponding radii while working in the field.

Q & A

What is the formula used to calculate the area of a radial plot?

The formula used to calculate the area of a radial plot is Area = πR², where R is the radius of the plot.

How many square feet are in one acre?

One acre contains 43,560 square feet.

How do you calculate the square footage for different sized plots like one third, one fourth, or one fifth of an acre?

To calculate the square footage for different sized plots, you divide 43,560 square feet by the respective fraction. For example, one third acre is 43,560 / 3 = 14,520 square feet.

What is the radius of a one third acre radial plot?

The radius of a one third acre radial plot is approximately 68 feet, calculated by taking the square root of 14,520 square feet divided by π.

How do you find the radius of a radial plot from its square footage?

To find the radius of a radial plot, you use the formula R = √(Area / π), where Area is the square footage of the plot.

What is the radius of a one fourth acre radial plot?

The radius of a one fourth acre radial plot is approximately 59 feet, calculated by taking the square root of 10,890 square feet divided by π.

How do you calculate the radius for a one fifth acre plot?

For a one fifth acre plot, the radius is found by taking the square root of 8,712 square feet (43,560 / 5) divided by π, resulting in a radius of approximately 53 feet.

Why is it important to round the radius values to the nearest foot?

Rounding the radius values to the nearest foot makes it easier to apply the measurements in the field, as precise values down to decimal points are not necessary for practical use.

What is the purpose of using radial plots in forest surveys?

Radial plots are used in forest surveys to measure and study various aspects of forested areas, such as tree density and size, by covering a specific amount of land area in a circular shape.

What could be a practical use for carrying a guide of radii sizes in the field?

A guide of radii sizes can be helpful in the field for quickly determining the appropriate radius for radial plots of various sizes, ensuring accurate and efficient survey measurements.