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ATMOSPHERIC CORRECTION ALGORITHM: SPECTRAL REFLECTANCES (MOD09)

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MODIS

Algorithm Technical Background Document

ATMOSPHERIC CORRECTION ALGORITHM: SPECTRAL
REFLECTANCES (MOD09)
Version 4.0, April 1999

NASA contract NAS5-96062

E. F. Vermote and A. Vermeulen
University of Maryland, Dept of Geography

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ABSTRACT
The following document is a description of the atmospheric correction algorithm
from which the surface reflectances will be calculated for MODIS channels 1 to 7Ê:
0.648 µm, 0.858 µm, 0.470 µm, 0.555 µm, 1.240 µm, 1.640 µm, and 2.13 µm. The
algorithm corrects for the effects of gaseous and aerosol scattering and absorption as
well as adjacency effects caused by variation of land cover, Bidirectional Reflectance
Distribution Function (BRDF) and atmosphere coupling effects, and contamination
by thin cirrus. At launch, the correction of aerosol scattering will be based on aerosol
climatology. Climatology will be superseded by MODIS-derived measurements of
aerosol optical thickness soon after launch when the MODIS aerosol product has
been succesfully evaluated. The correction is achieved by means of a look-up table
which provides the transmittances and path radiances for a variety of sun-sensor
geometry's and aerosol loadings. This document presents the algorithm theoretical
background and an outline of the pre-launch research agenda. This is a working
document that will evolve as the research and the product are developed.

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TABLE OF CONTENTS
1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.0

OVERVIEW AND BACKGROUND INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1

2.1 EXPERIMENTAL OBJECTIVE ............................................................................................................ 11
2.2 HISTORICAL PERSPECTIVE ............................................................................................................ 11
2.3 INSTRUMENT CHARACTERISTICS.................................................................................................... 14
3. ALGORITHM DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 9
3.1 THEORETICAL BACKGROUND .......................................................................................................... 19
3.1.1 Physics of the Problem ...........
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MODIS
Algorithm Technical Background Document
ATMOSPHERIC CORRECTION ALGORITHM: SPECTRAL
REFLECTANCES (MOD09)
Version 4.0, April 1999
NASA contract NAS5-96062
E. F. Vermote and A. Vermeulen
University of Maryland, Dept of Geography
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