Measuring a Big Tree
While a basic identification, a photo of the tree, and noting its locality are good, please try to take the time to measure the tree, the following measurements are essential:
Trunk Circumference
The trunk circumference is measured at 1.3 to 1.4 metres above the ground. When taking this measurement:
Crown Diameter
The crown diameter refers to the width of the tree’s canopy. To measure this:
Measure the projected crown diameter along both north-south and east-west directions for a more accurate representation.
(The best time of day to measure the crown diameter using the tree's shade would be midday when the sun is directly overhead. During this time:
Minimised Distortion: The sun casts the least amount of shadow distortion, meaning the shape and size of the tree's crown will be more accurately represented by its shadow.
More Accurate Diameter: With the sun overhead, the shadow is more circular, reflecting the true crown diameter in both the north-south and east-west directions.
If midday isn't possible, try measuring when the sun is as high as possible in the sky to reduce the distortion caused by long shadows. Avoid early morning or late afternoon when shadows are elongated, which can make the crown diameter appear larger or distorted.)
Tree Height
Measuring the tree's height is often the most challenging aspect because trees are rarely on level ground. However, height is crucial, as it greatly influences the tree size index. To measure the height:
By following these steps, you’ll be able to provide a more detailed and informative account of the tree’s size and structure.
Comments
Add a Comment