TY - JOUR

T1 - The normalization of surface anisotropy effects present in SEVIRI reflectances by using the MODIS BRDF method

AU - Proud, Simon Richard

AU - Zhang, Qingling

AU - Schaaf, Crystal

AU - Fensholt, Rasmus

AU - Rasmussen, Mads Olander

AU - Shisanya, Chris

AU - Mutero, Wycliffe

AU - Mbow, Cheikh

AU - Anyamba, Assaf

AU - Pak, Ed

AU - Sandholt, Inge

PY - 2014/1/1

Y1 - 2014/1/1

N2 - A modified version of the MODerate resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) algorithm is presented for use in the angular normalization of surface reflectance data gathered by the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) aboard the geostationary Meteosat Second Generation (MSG) satellites. We present early and provisional daily nadir BRDF-adjusted reflectance (NBAR) data in the visible and near-infrared MSG channels. These utilize the high temporal resolution of MSG to produce BRDF retrievals with a greatly reduced acquisition period than the comparable MODIS products while, at the same time, removing many of the angular perturbations present within the original MSG data. The NBAR data are validated against reflectance data from the MODIS instrument and in situ data gathered at a field location in Africa throughout 2008. It is found that the MSG retrievals are stable and are of high-quality across much of the SEVIRI disk while maintaining a higher temporal resolution than the MODIS BRDF products. However, a number of circumstances are discovered whereby the BRDF model is unable to function correctly with the SEVIRI observations - primarily because of an insufficient spread of angular data due to the fixed sensor location or localized cloud contamination.

AB - A modified version of the MODerate resolution Imaging Spectroradiometer (MODIS) bidirectional reflectance distribution function (BRDF) algorithm is presented for use in the angular normalization of surface reflectance data gathered by the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) aboard the geostationary Meteosat Second Generation (MSG) satellites. We present early and provisional daily nadir BRDF-adjusted reflectance (NBAR) data in the visible and near-infrared MSG channels. These utilize the high temporal resolution of MSG to produce BRDF retrievals with a greatly reduced acquisition period than the comparable MODIS products while, at the same time, removing many of the angular perturbations present within the original MSG data. The NBAR data are validated against reflectance data from the MODIS instrument and in situ data gathered at a field location in Africa throughout 2008. It is found that the MSG retrievals are stable and are of high-quality across much of the SEVIRI disk while maintaining a higher temporal resolution than the MODIS BRDF products. However, a number of circumstances are discovered whereby the BRDF model is unable to function correctly with the SEVIRI observations - primarily because of an insufficient spread of angular data due to the fixed sensor location or localized cloud contamination.

KW - Angular effects

KW - Anisotropy

KW - Bidirectional reflectance distribution function (BRDF)

KW - Land surface reflectance

KW - Meteosat Second Generation (MSG) Spinning Enhanced Visible and InfraRed Imager (SEVIRI)

KW - MODerate resolution Imaging Spectroradiometer (MODIS)

U2 - 10.1109/TGRS.2013.2294602

DO - 10.1109/TGRS.2013.2294602

M3 - Journal article

AN - SCOPUS:84901785572

VL - 52

SP - 6026

EP - 6039

JO - IEEE Transactions on Geoscience and Remote Sensing

JF - IEEE Transactions on Geoscience and Remote Sensing

SN - 0196-2892

IS - 10

M1 - 6727466

ER -