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Protocol Test - Trees
Task with Student Directions

GLOBE Assessment
Grade 9-12

Tree Circumference & Height Protocol Test

The Tree Circumference & Height protocol test assesses students' ability to take accurate tree circumference and height measurements.

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Tree Circumference & Height Protocol Test

 

 

 students-->

Student activity & Level of Performance

+ appropriate student performance

- inappropriate student performance

n.a. not appropriate or not observed

                                 
Tree Circumference                                  
Stand on level ground with object being measured                                  
Choose 5 trees of dominant species that reach the canopy (choose tallest, shortest & midrange)                                  
Measure & record circumference (cm) for each tree at height of 1.35m; record                                  
Repeat measurements for other tree species if < 5 trees of dominant species                                  
Tree Height                                  
Stand on level ground with object being measured                                  
Measure & record height of eyes from the ground                                  
Sight object through clinometer straw; move away from base of tree until clinometer reads 30° - 60°                                  
Partner records – BVW (string + washer)                                  
Measure & record distance from observer to object                                  
Calculate & record height of object:

Tree height = (TAN – BVW x distance to object) + eye height

                                 
Record height for 5 trees of dominant species; average                                  
Record height for 5 trees of co-dominant species, if present; average                                  
Include other tree species if < 5 trees of dominant or co-dominant species                                  

 


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