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Appendix D

Scatterplot and fitted regression model of visual estimation of percent open sky (VOS) vs. total solar radiation (TSR) index from analysis of hemispherical photographs (N=52: y=0 .739x + 15.601 , R2= 0.73 , SEE=5.899, p<.0001). For trees with low crown overlap (<30%,3d) R2=0.86, with high crown overlap (30%+,3d) R2=0.48. Slope and constant are not significantly different between low and high crown overlap regressions.

 
 
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