Keith Sprengel determining tree heights with laser rangefinder. Long-term mountain pine beetle thinning study. California Gulch study area, Oregon.
Photo by: Beth Willhite
Date: c.2007
Credit: USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection.
Source: Aerial Survey Program collection.
Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth