What are the modifications required for drone canopy leaf sampling?

Make sure the prop blades are protected.
Modify the tail to include a collection device. A very sharp blade at a sharp angle allows twigs to be cut off and often to remain caught in the space between the blade and tail.
Learn how to drive the drone using the camera.
For more on drones being used for Forestry Research at UC Berkeley, go to https://nature.berkeley.edu/garbelottowp/?s=drone.

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Nursery-Strain of Sudden Oak Death Found in Sierra Nevada.