Tree canopy coverage is measured as the area of ground shaded by a tree crown. A mature oak with a 60-foot crown spread covers approximately 2,827 square feet. Strategic tree placement on the south and west sides of a building can reduce cooling costs by 15-35%. Canopy coverage also increases property value by 7-19%, reduces stormwater runoff, and improves air quality. Municipal canopy goals typically target 40% urban tree coverage.
Measure the widest point of the canopy
Average US residential lot is ~8,500 sq ft. One acre = 43,560 sq ft.
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Canopy coverage is calculated from the crown spread (drip line diameter). Measure the widest point of the canopy in two perpendicular directions and average them. The coverage area equals pi times the radius squared. For example, a tree with a 40-foot average crown spread has a radius of 20 feet and covers approximately 1,257 square feet. Professional assessments may use aerial imagery or GIS mapping.
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