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Application of AISA measurements for water quality and benthic habitat mapping in optically shallow waters: challenges in radiometric calibration and atmospheric correction
EP23090
Poster Title: Application of AISA measurements for water quality and benthic habitat mapping in optically shallow waters: challenges in radiometric calibration and atmospheric correction
Submitted on 16 Jun 2015
Author(s): Minwei Zhang, Chuanmin Hu, David English, Paul Carlson, Frank E. Muller-Karger, Gerardo Toro-Farmer, Stanley R. Herwitz
Affiliations: University of South Florida
This poster was presented at IOCS2015
Poster Views: 923
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Poster Information
Abstract: An Airborne Imaging Spectrometer for Applications (AISA) hyperspectral imager was deployed on a manned aircraft flown at 1305m altitude to collect data over optically shallow waters in the Florida Keys with the ultimate goal of mapping water quality and benthic habitats. We developed a practical approach to effect an atmospheric correction (AC) to derive surface remote sensing reflectance (Rrs) of aquatic environments using radiative transfer simulations and constraints obtained from field spectral Rrs measurements. The AC approach accounts for aircraft altitude and non-zero near-infrared (NIR) reflectance through iteration. Simulations and comparison with concurrent in situ Rrs measurements show the possibility of error in the radiometric calibration of AISA, for which a definitive assessment cannot be made due to lack of enough concurrent in situ measurements. The need for noise reduction and the difficulty in applying vicarious calibration are discussed to help advance the design of future AISA missions. Summary: An atmospheric correction algorithm was developed for AISA data over optically shallow waters and was validated against in situ data. The challenges in the application of AISA data were discussed.Report abuse »
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