Patch recognition of algal blooms and macroalgae

K. H. Szekielda; J. H. Bowles; D. B. Gillis; W. Snyder; W. D. Miller

doi:10.1117/12.854772

20 April 2010 Patch recognition of algal blooms and macroalgae

K. H. Szekielda, J. H. Bowles, D. B. Gillis, W. Snyder, W. D. Miller

Proceedings Volume 7678, Ocean Sensing and Monitoring II; 76780A (2010) https://doi.org/10.1117/12.854772
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Fraunhofer lines and atmospheric absorption bands interfere with the spectral location of absorption bands of photosynthetic pigments in plankton. Hyperspectral data were used to address this interference on identifying absorption bands by applying derivative analysis of radiance spectra. Algal blooms show elevated radiance data even at longer wavelengths compared to oligotrophic water and may reach radiance values of around 800 W/m²/micrometer/sr at a wavelength of about 0.8 μm. Therefore, the use of a spectral range beyond 0.55 μm is useful to describe bloom characteristics. In particular, the slope between 0.55 μm to 0.80 μm shows an advantage to depict gradients in plankton blooms. Radiance spectra in the region from 0.4 to 0.8 μm for oligotrophic water and near coastal water show similar location of absorption bands when analyzed with derivative analysis but with different amplitudes. For this reason, radiance spectra were also analyzed without atmospheric correction, and various approaches to interpret radiance data over plankton blooms were investigated. Cluster analysis and ratio techniques at longer wavelengths were found to assist in the separation of ocean color gradients and distinguish bio-geochemical provinces in near-coastal waters. Furthermore, using the slope of spectra from plankton blooms, in connection with scatter diagrams at various wavelengths, shows that details can be revealed that would not be recognized in single channels at lower wavelength.

Citation Download Citation

K. H. Szekielda, J. H. Bowles, D. B. Gillis, W. Snyder, and W. D. Miller "Patch recognition of algal blooms and macroalgae", Proc. SPIE 7678, Ocean Sensing and Monitoring II, 76780A (20 April 2010); https://doi.org/10.1117/12.854772

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