Seattle's Canopy Cover

Download the report (pdf, 2.2 MB)

Download a presentation about the results (pdf, 3 MB)

Canopy cover is the percent of the city that's covered by trees, as seen in an aerial view.

In the past, Seattle's canopy cover was estimated at 18%, based on LIDAR (remote sensing) data and 1996 American Forests Landstat data collected in 2000. This is an older methodology with a larger range of error.

Recently, Seattle's canopy cover was re-visited to estimate levels in 2002/03 and 2007 using more current technology (QuickBird satellite data) and advanced data extraction methods. This assessment found that Seattle has about 23% canopy cover.

Seattle's goal, established in 2007, is to reach 30% canopy cover in 30 years. The data from the recent study is exciting because it provides critical information about recent canopy changes across the city as well as within different land uses, neighborhoods, and watersheds. This information allows the City to better plan and manage Seattle's urban forest.

The City will host community forums during the summer of 2009 to present this information and invite the public to discuss options for moving Seattle toward the 30% canopy cover goal. Check back to learn more as the project develops.

Learn more about remote sensing techniques like those used in this assessment.