A comparison of the effectiveness of 6S and SMAC in correcting for atmospheric interference of meteosat second generation images

TY - JOUR

T1 - A comparison of the effectiveness of 6S and SMAC in correcting for atmospheric interference of meteosat second generation images

AU - Proud, Simon Richard

AU - Fensholt, R.

AU - Rasmussen, M.O.

AU - Sandholt, I.

PY - 2010

Y1 - 2010

N2 - Atmospheric perturbations are a large source of uncertainty in remotely sensed imagery of the Earth's surface. This paper explores the effectiveness of the simplified method for atmospheric correction (SMAC) in reducing the effects of these perturbations in images of the African Continent gathered by the Spinning Enhanced Visible & InfraRed Imager (SEVIRI) aboard Meteosat Second Generation (MSG). In order to examine the accuracy of the SMAC we compare its results to those computed by the Second Simulation of the Satellite Signal in the Solar Spectrum (6SV1.1), a highly accurate radiative transfer code, for a wide range of atmospheric conditions. We find that the SMAC does not offer a high level of accuracy under many sets of atmospheric conditions with under 20% of observations in channels 1 and 2 providing a relative error of less than 10% when compared to 6SV1.1. Those observations involving medium-to-high solar or viewing zenith angles (greater than 40°) or in areas with a high ozone or water vapor content (greater than 0.2 cm/atm and 1.5 gm/cm2 for ozone and water vapor respectively) returning a particularly high relative error. Nevertheless, as the SMAC is up to 3000 times faster in processing a SEVIRI scene than 6SV1.1 it is still a useful atmospheric correction tool, particularly as a majority of the differences between the SMAC and 6S appear straightforward to correct for.

AB - Atmospheric perturbations are a large source of uncertainty in remotely sensed imagery of the Earth's surface. This paper explores the effectiveness of the simplified method for atmospheric correction (SMAC) in reducing the effects of these perturbations in images of the African Continent gathered by the Spinning Enhanced Visible & InfraRed Imager (SEVIRI) aboard Meteosat Second Generation (MSG). In order to examine the accuracy of the SMAC we compare its results to those computed by the Second Simulation of the Satellite Signal in the Solar Spectrum (6SV1.1), a highly accurate radiative transfer code, for a wide range of atmospheric conditions. We find that the SMAC does not offer a high level of accuracy under many sets of atmospheric conditions with under 20% of observations in channels 1 and 2 providing a relative error of less than 10% when compared to 6SV1.1. Those observations involving medium-to-high solar or viewing zenith angles (greater than 40°) or in areas with a high ozone or water vapor content (greater than 0.2 cm/atm and 1.5 gm/cm2 for ozone and water vapor respectively) returning a particularly high relative error. Nevertheless, as the SMAC is up to 3000 times faster in processing a SEVIRI scene than 6SV1.1 it is still a useful atmospheric correction tool, particularly as a majority of the differences between the SMAC and 6S appear straightforward to correct for.

KW - RADIATIVE-TRANSFER

KW - SUCCESSIVE ORDER

KW - SOLAR SPECTRUM

KW - LAND

KW - AEROSOLS

KW - EQUATION

KW - ALBEDO

KW - MODEL

KW - CODE

KW - MSG

UR - http://www.scopus.com/inward/record.url?scp=77957552431&partnerID=8YFLogxK

U2 - 10.1029/2009jd013693

DO - 10.1029/2009jd013693

M3 - Journal article

SN - 2169-9003

VL - 115

SP - D17209

JO - Journal of Geophysical Research: Earth Surface

JF - Journal of Geophysical Research: Earth Surface

IS - 17

ER -