Influence of aerosol estimation on coastal water products retrieved from HICO images

Karen W. Patterson; Gia Lamela

doi:10.1117/12.883263

4 May 2011 Influence of aerosol estimation on coastal water products retrieved from HICO images

Karen W. Patterson, Gia Lamela

Proceedings Volume 8030, Ocean Sensing and Monitoring III; 803005 (2011) https://doi.org/10.1117/12.883263
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

The Hyperspectral Imager for the Coastal Ocean (HICO™) is a hyperspectral sensor which was launched to the International Space Station in September 2009. The Naval Research Laboratory (NRL) has been developing the Coastal Water Signatures Toolkit (CWST) to estimate water depth, bottom type and water column constituents such as chlorophyll, suspended sediments and chromophoric dissolved organic matter from hyperspectral imagery. The CWST uses a look-up table approach, comparing remote sensing reflectance spectra observed in an image to a database of modeled spectra for pre-determined water column constituents, depth and bottom type. In order to successfully use this approach, the remote sensing reflectances must be accurate which implies accurately correcting for the atmospheric contribution to the HICO top of the atmosphere radiances. One tool the NRL is using to atmospherically correct HICO™ imagery is Correction of Coastal Ocean Atmospheres (COCOA), which is based on Tafkaa 6S. One of the user input parameters to COCOA is aerosol optical depth or aerosol visibility, which can vary rapidly over short distances in coastal waters. Changes to the aerosol thickness results in changes to the magnitude of the remote sensing reflectances. As such, the CWST retrievals for water constituents, depth and bottom type can be expected to vary in like fashion. This work is an illustration of the variability in CWST retrievals due to inaccurate aerosol thickness estimation during atmospheric correction of HICO™ images.

Citation Download Citation

Karen W. Patterson and Gia Lamela "Influence of aerosol estimation on coastal water products retrieved from HICO images", Proc. SPIE 8030, Ocean Sensing and Monitoring III, 803005 (4 May 2011); https://doi.org/10.1117/12.883263

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