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Appendix C

Examples of hemispherical photos of 4 vigor classes. Percent full sun is percent of total solar radiation calculated from hemispherical photographs.
Vigor Class 1: 12% Full Sun
Vigor Class 2: 25% Full Sun
Vigor Class 3: 43% Full Sun
Vigor Class 4: 67% Full Sun
 
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USDA Forest Service State & Private Forestry
WSU Cooperative Extension
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Last Updated 11/4/2019 3:32:00 PM