Tree Canopy Cover

Tree canopy cover (also called canopy coverage or urban tree canopy) is the measure of land area that falls beneath the vertical projection of tree crowns when viewed from above. Expressed as a percentage, it is the single most important metric for assessing the extent and distribution of an urban forest. Cities typically measure canopy cover using aerial imagery analysis, LiDAR data, or satellite imagery.

Research has established clear correlations between tree canopy cover and community benefits. Areas with higher canopy cover experience lower surface temperatures (sometimes 10-15 degrees Fahrenheit cooler on summer days), better air quality, reduced stormwater runoff, lower crime rates, higher property values, and better mental health outcomes for residents. These findings have driven many cities to establish canopy cover goals, with targets often ranging from 25% to 40%.

Canopy cover analysis also reveals environmental equity gaps. Studies in cities across the country consistently show that historically disadvantaged neighborhoods have significantly less tree canopy cover than wealthier areas. This disparity translates directly into higher heat-related health risks, poorer air quality, and reduced quality of life. Many municipalities are now prioritizing tree planting in low-canopy, low-income neighborhoods as both an environmental and social justice initiative.