567 
Middleton, E.M., 1992. Quantifying reflectance anisotropy of photosynthetically active radiation in grasslands. 
Journal of Geophysical Research, 97:18,935-18,946. 
Nicodemus, F.E., Richmond, J.C., Hsia, J.J., Ginsberg, I.W., and Limperis, T., 1977. Geometrical 
Considerations and Nomenclature for Reflectance. NBS Monograph 160, Institute for Basic Standards, 
Washington. D.C. 
Pinty, B, Verstraete, M.M., and Dickinson, R.E., 1990. A physical model of the bidirectional reflectance of 
vegetation canopies. 2. Inversion and validation. Journal of Geophysical Research, 95:11767-11775. 
Ross, J.K., and Marshak, A.L., 1989. Influence of leaf orientation and the specular component of leaf 
reflectance on the canopy bidirectional reflectance. Remote Sensing of Environment, 24:213-225. 
Salomonson, V.V., and Marlatt, W.E., 1971. Airborne measurements of reflected solar radiation. Remote 
Sensing of Environment, 2:1-8. 
Suits, G.H., 1972. The calculation of the directional reflectance of a vegetation canopy. Remote Sensing of 
Environment, 2:117-125.