An improvement to the volcano-scan algorithm for atmospheric correction of CRISM and OMEGA spectral data
The observations of Mars by the CRISM and OMEGA hyperspectral imaging spectrometers require correction for photometric, atmospheric and thermal effects prior to the interpretation of possible mineralogical features in the spectra. Here, we report on a simple, yet non-trivial, adaptation to the commo...
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Published in | Planetary and space science Vol. 57; no. 7; pp. 809 - 815 |
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Main Authors | , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.06.2009
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Subjects | |
Online Access | Get full text |
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Summary: | The observations of Mars by the CRISM and OMEGA hyperspectral imaging spectrometers require correction for photometric, atmospheric and thermal effects prior to the interpretation of possible mineralogical features in the spectra. Here, we report on a simple, yet non-trivial, adaptation to the commonly-used volcano-scan correction technique for atmospheric CO
2, which allows for the improved detection of minerals with intrinsic absorption bands at wavelengths between 1.9 and 2.1
μm. This volcano-scan technique removes the absorption bands of CO
2 by ensuring that the Lambert albedo is the same at two wavelengths: 1.890 and 2.011
μm, with the first wavelength outside the CO
2 gas bands and the second wavelength deep inside the CO
2 gas bands. Our adaptation to the volcano-scan technique moves the first wavelength from 1.890
μm to be instead within the gas bands at 1.980
μm, and for CRISM data, our adaptation shifts the second wavelength slightly, to 2.007
μm. We also report on our efforts to account for a slight ∼0.001
μm shift in wavelengths due to thermal effects in the CRISM instrument. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0032-0633 1873-5088 |
DOI: | 10.1016/j.pss.2009.03.007 |