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- W2007037136 abstract "The dynamic movement of cotton leaves in the presence of sunlight has been described using gyroscopic coordinates. These coordinates were used to calculate the position of leaf normals with respect to the sun on an individual basis. A sensitivity analysis established that the angle between a leaf normal and the sun was most affected by changes in pitch and roll. Averaging leaf normals by quadrant (as established by the direction of the compass) showed the pronounced heliotropic behavior of cotton leaves and the differential behavior of cotton leaves relative to the quadrant of the sun. These results were subsequently applied to the estimation of the phase angle γ between the canopy normals and sun from cross sections of bidirectional reflectance curves obtained for a band spanning 0.57–0.69 μm. From the cross section determined by the principal plane at 6:07 MST, which turned out to be concave and nearly symmetrical, the canopy averaged value for γ was estimated to be about 90°, while the calculated value from the leaf angle data was 85°. At 12:08 MST the same cross section was convex and asymmetrical with respect to rotation about the nadir direction, indicating distinguishable forescattered and backscattered components. For the forescattered component the estimated value for γ was 15°, and the calculated value 20°. For the backscattered component the estimated value for γ was 12°, and the calculated value 21°. These results suggested that bidirectional reflectance information analyzed sequentially using a visible band for which the optical transmission is nearly zero can be used to monitor leaf movement and hence moisture availability." @default.
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- W2007037136 date "1985-02-01" @default.
- W2007037136 modified "2023-09-27" @default.
- W2007037136 title "Effect of heliotropism on the bidirectional reflectance of irrigated cotton" @default.
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- W2007037136 doi "https://doi.org/10.1016/0034-4257(85)90109-9" @default.
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