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Foresty Suppliers: Using Forest Densiometers [Pdf]
Explains what a forest densiometer is, its history, and its use as a tool to measure forest overstory density, i.e., the area percentage that a tree canopy covers.
CK-12 Foundation
Ck 12: Physical Science: Calculating Derived Quantities
[Free Registration/Login may be required to access all resource tools.] Definition of derived quantity and calculation and units of derived quantities (area, volume, density).
CK-12 Foundation
Ck 12: Physical Science: Calculating Derived Quantities
[Free Registration/Login may be required to access all resource tools.] Definition of derived quantity and calculation and units of derived quantities (area, volume, density).