Comparisons between in Situ Anisotropic Reflectance Measurements and Simulations for Vegetation Canopies: Validation and Sensitivity Analysis

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Comparisons_between_in_Situ_Anisotropic_Reflectance_Measurements_and_Simulations_for_Vegetation_Canopies_Validation_and_Sensitivity_Analysis.pdf (321.04 KB)

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https://ieeexplore.ieee.org/document/4779467

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https://doi.org/10.1109/IGARSS.2008.4779467
 http://hdl.handle.net/11603/28648

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UMBC Joint Center for Earth Systems Technology (JCET)
UMBC Faculty Collection
UMBC Geography and Environmental Systems Department
UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0003-4148-9108
 https://orcid.org/0000-0003-0823-308X
 https://orcid.org/0000-0002-0505-4951

Date

2009-02-10

Type of Work

conference papers and proceedings
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Citation of Original Publication

Y. -B. Cheng et al., "Comparisons between in Situ Anisotropic Reflectance Measurements and Simulations for Vegetation Canopies: Validation and Sensitivity Analysis," IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium, Boston, MA, USA, 2008, pp. III - 790-III - 792, doi: 10.1109/IGARSS.2008.4779467.

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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.
Public Domain Mark 1.0

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Abstract

In situ directional reflectance observations were taken on trees of three species and were used to validate the Four-Scale Linear Model for AnIsotropic Reflectance (FLAIR). FLAIR-simulated spectra were satisfactory in general, especially for the shaded and shaded/sunlit mixed portions of the canopy but were species dependent. Good agreements with field observations were found when utilizing these simulations to derive band ratio indexes, Normalized Difference Vegetation Index (NDVI) and Photochemical Reflectance Index (PRI). Sensitivity analysis were performed to investigate the importance of three canopy biophysical parameters, and the leaf to shoot ratio showed the most impact on simulation results. The results in this study showed the potential to simulate directional reflectances with FLAIR on canopies with complicated structure.