Spectral Overlap Correction Using Weighted Deconvolution for Improved Dark Object Technique for Correction of EO1-Hyperion Data
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We present a critical modification to improved dark object technique for correcting hyperspectral data (EO1-Hyperion). The modification is required in improved dark object technique as the original method does not take into account overlap of spectral response functions of two adjacent bands of hyperspectral sensor. We used weighted deconvolution for correcting the original overlap affected path radiance correction propagation factors. Further, we compared the reduction in correction factors—in different conditions—because of the overlap. We calculated the path radiance for April 22 Hyperion image and compared it with other methods such as 6SV. We found noticeable difference in corrected and uncorrected path radiance propagation factors with “clear” to “very clear” atmospheric models. For the other models (“moderate”, “hazy”, “very hazy”), the difference is negligible and can be ignored and improved dark object technique can be applied without any overlap correction.
KeywordsEO1-Hyperion Improved dark object technique Overlapping bands Spectral deconvolution
Shailesh Deshpande would like to thank Dr. Daniel Schläpfer for valuable discussion on spectral deconvolution, and Dr. David Jupp for providing useful links for Hyperion spectral response functions. He would also like to thank Prof. Harrick Vin for encouragement and support throughout the work. We thank principal investigators for their effort in establishing and maintaining AERONET Pune site.
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