섬유

effect of heliotropism on the bidirectional reflectance of irrigated cotton

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 251
the dynamic movement of cotton leaves in the presence of sunlight has been described using gyroscope 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 $gamma$ between the canopy normals and the sun from cross sections of bidirectional reflectance curves obtained for a band spanning 0. 57-0. 69 $mu$ m. 16 refs
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