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Table 1 Designed gap fraction (GFd) and side length of square opening (L) of the 17 model canopies

From: Sky-canopy border length, exposure and thresholding influence accuracy of hemispherical photography for complex plant canopies

Designed gap fraction (GFd) Side length of square opening (L) (mm)
2.50 5.00 10.00 20.00
0.05 8.68, 0.08 17.36, 0.04 34.72, 0.02 –, –
0.10 5.41, 0.16 10.81, 0.08 21.62, 0.04 –, –
0.25 2.50, 0.40 5.00, 0.20 10.00, 0.10 20.00, 0.05
0.50 1.04, 0.80 2.07, 0.40 4.14, 0.20 8.28, 0.10
0.75 –, – 0.77, 0.60 1.55, 0.30 3.09, 0.15
  1. The left and right values in each cell show the separation width between square openings (W; mm) and SCB length per unit area (B; mm mm−2) respectively. GFd = L2/(L + W)2. B = 4∙L/(L + W)2