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4 November 1996 Atmospheric corrections for mid-IR (3- to 5-μm) spectroscopy
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Terrestrial spectroscopy in the 3 - 5 micrometer wavelength region offers unique applications, such as detection of carbon and sulfur compounds, and subpixel temperature determination of ground fires and volcanic lava flows. Two challenges in this region are the similar levels of solar reflected and terrestrial emitted fluxes, and the low values of both these fluxes making measurements of high quality more difficult than in the short-wave or long-wave IR regions. We collected airborne hyperspectral images with a Fourier transform spectrometer over seawater in a tropical environment combined with radiosonde data and MODTRAN atmospheric modeling, to distinguish ground radiances, atmospheric contributions, and spurious instrumental effects. Within the range of our radiosonde data (3 km altitude), MODTRAN very closely reproduces the sensor- detected mid-IR fluxes. Clear separation between solar reflected and terrestrial emitted components is achieved, and different atmospheric compositional spectral effects are analyzed. We applied the results from this well-truthed experiment, to spectra collected of the same locations at different times without supporting radiosonde data, to assess surface radiance accuracy and atmospheric variability.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Karl W. Bornhoeft, Paul G. Lucey, and Keith A. Horton "Atmospheric corrections for mid-IR (3- to 5-μm) spectroscopy", Proc. SPIE 2818, Multispectral Imaging for Terrestrial Applications, (4 November 1996);

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