Generation of high-resolution ocean color information from five particular bands: a case 2 water approach

Marcel R. Wernand; Susan J. Shimwell; Jan C. de Munck

doi:10.1117/12.266405

6 February 1997 Generation of high-resolution ocean color information from five particular bands: a case 2 water approach

Marcel R. Wernand, Susan J. Shimwell, Jan C. de Munck

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Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266405
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Ground truth measurements ar necessary for the validation of remotely sensed data. Rapid ship or aircraft spectral measurements of the upwelling and downwelling radiance are needed to determine the reflectance of the water column as well as to intercalibrate with satellite sensors. Inter calibrations are hindered by the application of different instruments with varying spectral bands. It has been found that high resolution ocean color data do not contain more information on water quality than data from a limited amount of spectral bands. However the positioning of these spectral bands over the visible spectrum should be correctly chose. The present work uses a reconstruction technique which would enable simple optical instruments with 5 specific bands to be used to determine water quality parameters and to validate satellite data even if the sensors differ in central wavelengths. It is shown that when an optical data back (ODB) of high resolution spectra of a specific sea area is available it is possible to reconstruct complete reflectance spectra, accurate to within 1 percent, out of the reflectance measured in 5 bands. Such an ODB could contain subsurface or airborne reflectance data. The reconstruction technique used is based upon a multiple regression analysis of the ODB. To validate this full reflectance spectrum reconstruction method spectral data collected with different radiometers in different locations were successfully regenerated from 5 specific bands. Another advantage of the reconstruction technique is the storage of high resolution spectral data by means of only 5 bands. It is proposed that airborne spectral reflectance measurements could stay limited to only 5 specific spectral bands.

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Marcel R. Wernand, Susan J. Shimwell, and Jan C. de Munck "Generation of high-resolution ocean color information from five particular bands: a case 2 water approach", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266405

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KEYWORDS

Reflectivity

Sensors

Water

Radiometry

Satellites

Solids

Spectral resolution

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