Specularly modified vegetation indices to estimate photosynthetic activity

Abstract The hypothesis tested was that some part of the ecosystem-dependent variability of vegetation indices was attributable to the effects of light specularly reflected by leaves. ‘Minus specular’ indices were defined excluding effects of specular light which contains no cellular pigment information Results, both empirical and theoretical, show that the ‘minus specular’ indices, when compared to the traditional vegetation indices, potentially provide better estimates of the photosynthetic activity within a canopy—and therefore canopy primary production—specifically as a function of Sun and view angles.

[1]  Inez Y. Fung,et al.  Application of Advanced Very High Resolution Radiometer vegetation index to study atmosphere‐biosphere exchange of CO2 , 1987 .

[2]  L. Grant,et al.  Polarization of light scattered by vegetation , 1985, Proceedings of the IEEE.

[3]  J. Townshend,et al.  African Land-Cover Classification Using Satellite Data , 1985, Science.

[4]  P. Sellers.  Canopy reflectance, photosynthesis, and transpiration. II. the role of biophysics in the linearity of their interdependence , 1987 .

[5]  F. Baret,et al.  Potentials and limits of vegetation indices for LAI and APAR assessment , 1991 .

[6]  P. J. Curran,et al.  Remote sensing using partially polarized light , 1986 .

[7]  Vern C. Vanderbilt,et al.  Polarized and non-polarized leaf reflectances of Coleus blumei , 1987 .

[8]  Maurice Herman,et al.  Polarization of light reflected by crop canopies , 1991 .

[9]  L. Grant.  Diffuse and specular characteristics of leaf reflectance , 1987 .

[10]  B F Robinson,et al.  Specular, diffuse, and polarized light scattered by two wheat canopies. , 1985, Applied optics.

[11]  V. Vanderbilt,et al.  Plant Canopy Specular Reflectance Model , 1985, IEEE Transactions on Geoscience and Remote Sensing.

[12]  J. Ross.  The radiation regime and architecture of plant stands , 1981, Tasks for vegetation sciences 3.

[13]  G. Asrar,et al.  Estimating Absorbed Photosynthetic Radiation and Leaf Area Index from Spectral Reflectance in Wheat1 , 1984 .

[14]  A. Huete.  A soil-adjusted vegetation index (SAVI) , 1988 .

[15]  S. Prince.  A model of regional primary production for use with coarse resolution satellite data , 1991 .

[16]  P. Sellers.  Canopy reflectance, photosynthesis and transpiration , 1985 .

[17]  Susan L. Ustin,et al.  Polarization of Light by Vegetation , 1991 .

[18]  G. Guyot,et al.  POLARISATION DE LA LUMIÈRE PAR LES COUVERTS VÉGÉTAUX: POSSIBILITÉS D'APPLICATIONS AGRONOMIQUES , 1990 .

[19]  W. Verhoef.  Light scattering by leaf layers with application to canopy reflectance modelling: The SAIL model , 1984 .

[20]  Ghassem R. Asrar,et al.  Theory and applications of optical remote sensing. , 1989 .

[21]  G. Campbell.  Extinction coefficients for radiation in plant canopies calculated using an ellipsoidal inclination angle distribution , 1986 .