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.

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.

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.

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

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