Basic Concepts
Crown closure helps predict volume, stand density, crown width, and crown competition factor. Crown closure is often determined using aerial photographs because ground evaluations become difficult to obtain. Stands are usually placed in to different classes (1-6) after viewing the aerial photographs.
- Very Sparse 1-9%
- Sparse 10-29%
- Low 30-49%
- Medium 50-69%
- Dense 70-84%
- Very Dense 85-100%
Although sometimes referred to as canopy cover and canopy closure, crown closure is different from these two concepts. Canopy cover represents the aggregate of all vertically projected tree crowns onto the ground surface, while canopy closure represents the amount of the sky obscured by the canopy from a certain point on the ground.
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