Spectral Bidirectional and Hemispherical Reflectance Characteristics of Selected Sites in the Streletskaya Steppe

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Spectral_Bidirectional_and_Hemispherical_Reflectance_Characteristics_of_Selected_Sites_in_the_Streletskaya_Steppe.pdf (403.53 KB)

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https://ieeexplore.ieee.org/document/578339

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https://doi.org/10.1109/IGARSS.1992.578339
 http://hdl.handle.net/11603/33330

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UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0001-9801-1610

Date

1992-05-26

Type of Work

conference papers and proceedings
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Citation of Original Publication

Eck, T.F., and D.W. Deering. “Spectral Bidirectional and Hemispherical Reflectance Characteristics of Selected Sites in the Streletskaya Steppe.” [Proceedings] IGARSS ’92 International Geoscience and Remote Sensing Symposium 2 (May 1992): 1053–55. https://doi.org/10.1109/IGARSS.1992.578339.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Subjects

Clouds
Instruments
Anisotropic magnetoresistance
Bidirectional control
Reflectivity
Vegetation
Atmospheric measurements
Extraterrestrial measurements
Productivity
Soil measurements

Abstract

Measurements of plant canopy bidirectional reflectance made by the PARABOLA (Portable Apparatus for Rapid Acquistion of Bidirectional Observations of the Land and Atmosphere) instrument in three spectral bands (662,826,1658 nm) are analyzed for steppe grassland sites of differing productivity levels. The variation of spectral reflectance and the normalized difference vegetation index in the solar principal plane is presented. Comparisons are made with PARABOLA measurements from selected FIFE grassland sites in the Konza Prairie, Kansas. The Streletskaya Steppe sites showed no strong hot spot reflectance, while this effect was present in some FIFE sites but absent in others. The hot spot effect seems to be dependent on canopy geometry and background reflectance characteristics of these sites. Spectral hemispherical reflectance was computed from the angular integration of the directional measurements for the steppe sites. Total shortwave albedo was estimated from these hemispherical reflectance measurements and compared to albedo measured by pyranometers. The albedo estimates from PARABOLA were found to be from approximately 12-17% higher than the pyranometer measurements.