The breadth and longevity of the PNW-PSP Program are unparalleled in the U.S., with more than 135 installations, over 115,000 tagged trees, and data records spanning several decades to a century.

Many of the permanent plots are located in old-growth forests, providing insights into the processes and habitats that characterize these forests.

Historical significance: The PNW-PSP Program includes studies that were established more than 100 years ago to quantify the growth and yield of key timber species in the Pacific Northwest.

Remotely sensed data from LiDAR (light ranging and detection) are ground-truthed with stem-mapped data from permanent plots.

The PNW-PSP Program is based at Oregon State University and the HJ Andrews Experimental Forest (pictured), where permanent plot research dates to the 1960’s.

Home Page