ESTIMATES OF ABSORBED RADIATION AND LEIP AREA

Estimating the quantity and quality of vegetation is a primary goal of remote sensing. The impact of changing sun-view-target geometry on spectral measures of vegetative amount (vegetative indices, VIs) has been a major source of concern with this pursuit. A field experiment was conducted to test the statistical significance of solar and view zenith angle effects on the regression coefficients of relationships established between the simple ratio and normalized difference vegetation indices and the biophysical parameters fraction of absorbed photosynthetically active radiation (APAR) and leaf area index (LAI). Measurements of spectra