A note on the G-function for needle leaf canopies

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GAI estimates of row crops from downward looking digital photos taken perpendicular to rows at 57.5° zenith angle: Theoretical considerations based on 3D architecture models and application to wheat crops (2010, background): “According to (Lang, 1991) and (Stenberg, 2006), the area index of non-flat objects such as stems and ears should be computed as half the developed area of the associated convex hull per unit soil area.”
Estimating leaf inclination and G-function from leveled digital camera photography in broadleaf canopies (2011, methodology): “other indirect methods, the digital camera method might not be relevant to needleleaf trees (Stenberg 2006) because it is unlikely to capture individual needles from some distance.”