Canopy architecture contributions to hot spot reflectance.

摘要

The purpose of this study was to isolate factors contributing to the formation of the hot spot feature of vegetation canopy bidirectional reflectance.;A model relating canopy architecture contributions to the formation of the hot spot was developed using a canopy divided into horizontal layers of equal leaf area index thicknesses. The basis for the model includes the use of gap, and foliage (or dark space) distributions. A dark space distribution function was developed as a part of this study.;Directional reflectance data measured at the hot spot view angle were collected for alfalfa, coarse fescue turfgrass, and soybeans using a video recording system. The video data were digitized for the final analysis. A deconvolution procedure was used to remove penumbral shadow effects obscuring part of the hot spot intensity decrease away from the central peak value.