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The Spectral Invariant Approximation Within Canopy Radiative Transfer to Support the Use of the EPIC/DSCOVR Oxygen B-band for Monitoring VegetationEPIC (Earth Polychromatic Imaging Camera) is a 10-channel spectroradiometer onboard DSCOVR (Deep Space Climate Observatory) spacecraft. In addition to the near-infrared (NIR, 780 nm) and the 'red' (680 nm) channels, EPIC also has the O2 A-band (764+/-0.2 nm) and B-band (687.75+/-0.2 nm). The EPIC Normalized Difference Vegetation Index (NDVI) is defined as the difference between NIR and 'red' channels normalized to their sum. However, the use of the O2 B-band instead of the 'red' channel mitigates the effect of atmosphere on remote sensing of surface reflectance because O2 reduces contribution from the radiation scattered by the atmosphere. Applying the radiative transfer theory and the spectral invariant approximation to EPIC observations, the paper provides supportive arguments for using the O2 band instead of the red channel for monitoring vegetation dynamics. Our results suggest that the use of the O2 B-band enhances the sensitivity of the top-of-atmosphere NDVI to the presence of vegetation.
Document ID
20170008787
Acquisition Source
Goddard Space Flight Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Alexander Marshak (Goddard Space Flight Center Greenbelt, Maryland, United States)
Yuri Knyazikhin (Boston University Boston, Massachusetts, United States)
Date Acquired
September 14, 2017
Publication Date
January 12, 2017
Publication Information
Publication: Journal of Quantitative Spectroscopy and Radiative Transfer
Publisher: Elsevier
Volume: 191
Issue Publication Date: April 1, 2017
ISSN: 0022-4073
DOI: doi:10.1016/j.jqsrt.2017.01.015
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN45511
Distribution Limits
Public
Copyright
Public Use Permitted.

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