Radiative-transfer-based retrieval of reflectance from calibrated radiance imagery measured by an imaging spectrometer for lithological mapping of the Clark Mountains, California

Robert O. Green

doi:10.1117/12.21353

1 September 1990 Radiative-transfer-based retrieval of reflectance from calibrated radiance imagery measured by an imaging spectrometer for lithological mapping of the Clark Mountains, California

Robert O. Green

Author Affiliations +

Proceedings Volume 1298, Imaging Spectroscopy of the Terrestrial Environment; (1990) https://doi.org/10.1117/12.21353
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Spectral radiance imagery measured by the Airborne Visibleflnfrared Imaging Spectrometer (AVIRIS) are reduced to reflectance through compensation for atmospheric scattering water vapor absorption absorption of the well mixed gases solar irradiance and the solar zenith angle. The LOWTRAN 7 (Kneizys et al. 1989) radiative transfer code form the basis for this retrieval. LOWTRAN 7 is constrained with water vapor determinations from the AVIRIS radiance data through an algorithm operating on the 940 urn atmospheric water band for every spatial element. In situ measurements of atmospheric optical depths are used to constrain the LOWTRAN 7 aerosol models. Accuracy of the retrieved reflectance spectra is evaluated with respect to surface spectra measured at the time of the overflight. The mineral bastnaesite is identified in the analysis of the retrieved reflectance imagery. These reflectance data provide a means to map the subtle mineral gradients in the PreCambrian block of the Clark Mountain range in southeastern California for geological analysis. 1. 0

Citation Download Citation

Robert O. Green "Radiative-transfer-based retrieval of reflectance from calibrated radiance imagery measured by an imaging spectrometer for lithological mapping of the Clark Mountains, California", Proc. SPIE 1298, Imaging Spectroscopy of the Terrestrial Environment, (1 September 1990); https://doi.org/10.1117/12.21353

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