Processing OMEGA/Mars Express hyperspectral imagery from radiance-at-sensor to surface reflectance

OMEGA/Mars Express hyperspectral imagery is an excellent source of data for exploring the surface composition of the planet Mars. Compared to terrestrial hyperspectral imagery, the data are challenging to work with; scene-specific transmission models are lacking, spectral features are shallow making...

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Bibliographic Details
Published in:Planetary and space science 2014-01, Vol.90, p.1-9
Main Authors: Bakker, W.H., van Ruitenbeek, F.J.A., van der Werff, H.M.A., Zegers, T.E., Oosthoek, J.H.P., Marsh, S.H., van der Meer, F.D.
Format: Article
Language:English
Subjects:
3D-filtering
Atmospheric correction
Image processing
Mars
Mars Express
Mineralogy
OMEGA
Spatio-spectral filtering
Transmittance model
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Summary:OMEGA/Mars Express hyperspectral imagery is an excellent source of data for exploring the surface composition of the planet Mars. Compared to terrestrial hyperspectral imagery, the data are challenging to work with; scene-specific transmission models are lacking, spectral features are shallow making them difficult to detect, and field data for validation is mostly not available. Software is available for calibrating the raw data to radiance-at sensor, but a processing methodology for processing the radiance data to surface reflectance is not straightforward. In this paper, we present a processing methodology for converting OMEGA data from radiance-at-sensor to surface reflectance. To overcome specific issues with OMEGA data, we developed novel methods for determining a per-scene transmittance spectrum, performing an atmospheric correction, and filtering systematic and random noise. The processing methodology produces surface reflectance images, from which single-pixel spectra can be extracted to identify surface features. Consistent with several previous studies, our results indicate the presence on the Martian surface of iron-rich clays. •We present a new processing methodology for OMEGA/Mars Express hyperspectral imagery.•Radiance-at-sensor data are converted to surface reflectance.•Atmospheric corrections are applied with in-scene statistic.•Results are useful for studying surface mineralogy of Mars.•Selected spectra suggest the presence of Fe-rich clays, consistent with previous studies.
ISSN:0032-0633
1873-5088
DOI:10.1016/j.pss.2013.11.007