(1991). "Vegetation Canopies and Objects of Arbitrary Shapes: Computer Generation and Bidirectional Reflection Calculations." <i>Proc. 5th Int. Colloq. Phys. Measurements & Signatures in Remote Sensing</i> v1, 14-18 Jan 1991, Courchevel, France.
(1991). "Vegetation Canopies and Objects of Arbitrary Shapes: Computer Generation and Bidirectional Reflection Calculations." Proc. 5th Int. Colloq. Phys. Measurements & Signatures in Remote Sensing v1, 14-18 Jan 1991, Courchevel, France.
Goel, Narendra S., Ivan Rozehnal, and Richard L. Thompson. "Vegetation canopies and arbitrary shapes: computer generational and bidirectional reflectance cacluations," Proceedings of the 5th International Colloquium on Physical Measurements and Signatures in Remote Sensing, 14–18 January, Courchevel, France. ESA SP-319. Noordwijk: European Space Agency, 1991, pp. 409–413.
A general computer graphics based model is presented for computer generation of objects of arbitrary shape and for calculating Bidirectional Reflectance Factor (BRF) and scattering from them, in the optical region. The computer generation uses a modified Lindemayer system (L system) approach. For rendering on a computer screen, the object is divided into polygons, and innovative computer graphics techniques are used to display the object and to calculate the scattering and reflectance from the object. The use of the technique is illustrated with scattering from canopies of simulated corn plants and from a snow covered mountain. The scattering is quantified using measures like BRF and albedo and by rendering the objects with brightness of each of the two facets of a polygon proportional to the amount of light scattered from the object in the viewer's direction.
NASA funding supported this research.