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EFS NA Week 2: Comparing measured, paced and estimated values


You are working on site and have been asked to determine the area of a rectangular patch of ground that is to be replanted with native species as part of the reclamation of the site. You want to determine how good your developing estimation and pacing skills are and so decide to estimate its length and width and then to measure these dimensions with a field tape to compare. Your estimated, paced, and measured values are in the table below.

To calculate the area to be planted, multiply the length times the width for each of the estimated, paced, and measured methods. Enter your calculated area into the table.

Visually estimated
square metres
square metres
square metres

Some Additional Questions

  • How much does each of the linear distances vary from each other between estimated and paced? Estimated and measured? Paced and measured?
  • How much do the calculated areas vary from each other? Is it greater of less than the differences when you are doing linear measurement?
Reflect and describe your thoughts.

Using the measured values from the table:

  1. Assume we need to place 0.3 m of topsoil over the entire area in order to plant our native shrubs and trees. What volume of fill would you need to order to fill this rectangle to a depth of 0.3 m?
  2. Assume we need to place a fence around this feature to keep people and animals out. What is the total length of fencing you would need to order to completely surround the area?
cubic metres
Round to the nearest whole number.