View Zenith Angle Effects on the Forest Information Content of Three Spectral Indices

By F. Gemmell, A. McDonald. 2000

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Bidirectional reflectance of Earth targets: evaluation of analytical models using a large set of spaceborne measurements with emphasis on the Hot Spot (2004, methodology): “These models may be classified into (i) ray-tracing simulations (e.g. Gascon et al., 2001; Gemmell & McDonald, 2000); (ii) complex models that fully analyze the radiative transfer within the canopy (e.g. Chen & Leblanc, 1997; Kuusk, 1995); (iii) analytical models based on various approximations of…”
Remote sensing methods in medium spatial resolution satellite data land cover classification of large areas (2002, background): “The variations because of BRDF are sometimes apparent in wide-angle or pointable satellite systems, such as the SPOT, AVHRR, SPOT VEGETATION or EOS MODIS sensors (Donoghue, 1999; Running et al ., 2000).”
Angular sensitivity analysis of vegetation indices derived from CHRIS/PROBA data (2008, background): “…advocated that a multiangular viewing improved the performance of indices (e.g. NDVI) for discriminating cover and leaf area index (LAI), when compared to nadir viewing because it explicitly accounts for structural heterogeneity and canopy shading (Diner et al., 1999; Gemmell & McDonald, 2000).”