Resources
Everything you need to measure trees accurately — illustrated guides, videos, and scientific references.
How to Measure a Tree
Two key measurements every tree inventory needs: trunk diameter (DBH) and crown diameter.
Diameter at Breast Height (DBH)
Wrap a measuring tape around the trunk at exactly 1.3 meters above the ground. If the tree grows on a slope, measure 1.3 m from the uphill side. Record the diameter in centimeters.
Crown Diameter
Find the widest point of the canopy and measure it end-to-end. Then measure again at a right angle. Record both values — North–South and East–West — in meters.
Illustrations adapted from: Roman et al. (2020). Urban tree monitoring: a field guide. USDA Forest Service, Gen. Tech. Rep. NRS-194.
Video Guides
Short tutorials to help students and teachers get comfortable measuring trees in the field.
Videos coming soon — check back here!