14 July 1988 Goniometric Observations Of Light Scattered From Soils And Leaves
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Abstract
A laboratory facility has been established at NASA/Goddard Space Flight Center to measure and model light scattered by soil samples and by individual plant leaves. Two goniometers have been built for this laboratory, one to measure directional reflectance and transmittance from vertically mounted samples such as leaves, the other to measure directional reflectance from horizontal, semi-infinite particulate surfaces such as soil samples. The design and operation of these two devices are discussed. Goniometric observations of various soil minerals and plant leaves are also presented. Level, semi-infinite surfaces consisting of quartz particles, for example, are shown to reflect red light diffusely when illuminated from zenith angles of less than 45 degrees. As an example of leaf observations, the magnitudes of oak leaf reflectance and transmittance are shown to depend upon leaf color. The goniometric measurements are compared to a model of reflectance from particulate surfaces or to a ray-tracing model of leaf reflectance and transmittance.
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Joann M Kestner, Joann M Kestner, Henning W Leidecker, Henning W Leidecker, James R Irons, James R Irons, James A Smith, James A Smith, Thomas W Brakke, Thomas W Brakke, Ned A Horning, Ned A Horning, } "Goniometric Observations Of Light Scattered From Soils And Leaves", Proc. SPIE 0927, Wave Propagation and Scattering in Varied Media, (14 July 1988); doi: 10.1117/12.945834; https://doi.org/10.1117/12.945834
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