Vegetation Angular Signatures of Equatorial Forests From DSCOVR EPIC and Terra MISR Observations release_4nkpet5a55brzechl2kv6euq6u

by Xiangnan Ni, Yuri Knyazikhin, Yuanheng Sun, Xiaojun She, Wei Guo, Oleg Panferov, Ranga B. Myneni

Published in Frontiers in Remote Sensing by Frontiers Media SA.

2021  

Abstract

In vegetation canopies cross-shading between finite dimensional leaves leads to a peak in reflectance in the retro-illumination direction. This effect is called the hot spot in optical remote sensing. The hotspot region in reflectance of vegetated surfaces represents the most information-rich directions in the angular distribution of canopy reflected radiation. This paper presents a new approach for generating hot spot signatures of equatorial forests from synergistic analyses of multiangle observations from the Multiangle Imaging SpectroRadiometer (MISR) on Terra platform and near backscattering reflectance data from the Earth Polychromatic Imaging Camera (EPIC) onboard NOAA's Deep Space Climate Observatory (DSCOVR). A canopy radiation model parameterized in terms of canopy spectral invariants underlies the theoretical basis for joining Terra MISR and DSCOVR EPIC data. The proposed model can accurately reproduce both MISR angular signatures acquired at 10:30 local solar time and diurnal courses of EPIC reflectance (NRMSE &amp;lt; 9%, R<jats:sup>2</jats:sup> &amp;gt; 0.8). Analyses of time series of the hot spot signature suggest its ability to unambiguously detect seasonal changes of equatorial forests.
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https://www.frontiersin.org/articles/10.3389/frsen.2021.766805/full
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Date   2021-10-28
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