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Correction of ozone influence on TOA radiance

Richter, Rudolf and Heege, Thomas and Kiselev, Viacheslav and Schläpfer, Daniel (2014) Correction of ozone influence on TOA radiance. International Journal of Remote Sensing, 35 (23), pp. 8044-8056. Taylor & Francis. DOI: 10.1080/01431161.2014.978041 ISSN 0143-1161

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Official URL: http://www.tandfonline.com/toc/tres20/35/23

Abstract

An accurate atmospheric correction (AC) of Earth remote-sensing data in the spectral region 450–800 nm has to account for the ozone gas absorption influence. Usual operational AC codes employ a fixed ozone concentration corresponding to a climatologic average for a certain region and season, e.g. the mid-latitude summer atmosphere of the Moderate Resolution Atmospheric Transmission (MODTRAN) code. The reasons for a fixed ozone column are that ozone does not vary rapidly on a spatial and temporal scale, and additionally, the look-up table (LUT) size for AC is already big. This means that another degree of freedom for the ozone parameter would dramatically increase the size of the LUT database and the time required for LUT interpolation. In order to account for this effect, we use already existing LUTs that were calculated for a certain ozone reference level, e.g. an ozone column of g = 330 Dobson Units (DU) for MODTRAN’s mid-latitude summer atmosphere. Then the deviation of the top-of-atmosphere (TOA) radiance ΔL(g) from the reference level L(g = 330) is calculated as a function of solar and view geometries. The calculation is performed for a set of 36 wavelengths in the ozone-sensitive spectrum (450–800 nm) and five ozone columns. The last step computes the linear regression coefficients for each wavelength and geometry. The results are stored in a small table (11 kB). It is shown that the ozone influence is accurately accounted for by multiplying the modelled radiance L(g = 330) with a factor depending on g and wavelength yielding TOA radiance relative errors smaller than 0.5% for a wide range of ozone concentrations between 180 and 500 DU. Selected examples of a sensitivity study of the ozone effect on the retrieval of water constituents demonstrate the need to account for ozone in the AC step.

Item URL in elib:https://elib.dlr.de/96228/
Document Type:Article
Title:Correction of ozone influence on TOA radiance
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Richter, Rudolfrudolf.richter (at) dlr.deUNSPECIFIED
Heege, Thomasheege (at) eomap.deUNSPECIFIED
Kiselev, Viacheslavkiselev (at) eomap.deUNSPECIFIED
Schläpfer, DanielReSe ApplicationsUNSPECIFIED
Date:26 November 2014
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:35
DOI :10.1080/01431161.2014.978041
Page Range:pp. 8044-8056
Editors:
EditorsEmail
Warner, Timothy A.West Virginia University, USA
Publisher:Taylor & Francis
ISSN:0143-1161
Status:Published
Keywords:Atmospheric correction
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben hochauflösende Fernerkundungsverfahren
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Photogrammetry and Image Analysis
Deposited By: Makarau, Aliaksei
Deposited On:08 May 2015 14:27
Last Modified:08 May 2015 14:27

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