The Spectral Invariant Approximation within Canopy Radiative Transfer to Support the Use of the EPIC/DSCOVR Oxygen B-band for Monitoring Vegetation

Files
AM_AGU16_NDVIposterFinal.pdf(3.31 MB)
Accepted manuscript
Date
2017-12-13
DOI
Authors
Marshak, Alexander
Yang, Bin
Knjazihhin, Juri
Version
OA Version
Citation
Alexander Marshak, Bin Yang, Juri Knjazihhin. 2017. "The Spectral Invariant Approximation within Canopy Radiative Transfer to Support the Use of the EPIC/DSCOVR Oxygen B-band for Monitoring Vegetation." A33D Deep-Space Earth Observations II Posters presented at AGU Fall Meeting, New Orleans, December 11-15, 2017
Abstract
EPIC (Earth Polychromatic Imaging Camera) is a 10-channel spectroradiometer onboard DSCOVR (Deep Space Climate Observatory) spacecraft. In addition to the 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 at-sensor 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 ofatmosphere on surface reflectance because it reduces contribution from the radiation scattered by theatmosphere. Applying the radiative transfer theory and the spectral invariant approximation to EPIC observations, we provide supportive arguments for using the O2 band instead of the red channel for monitoring the vegetation dynamics.
Description
License