University of Twente Student Theses


Are mussels and oysters spectrally distinct?

Geliah, Gloria A. (2013) Are mussels and oysters spectrally distinct?

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Abstract:The spectral distinctness of blue mussels and Japanese oysters were investigated and were found to be unique. Absorption features characteristic to carbonates and to water were found in their spectra. The general shape of their spectra was similar, but statistically different wavelengths were found in the visible range, particularly between 350 to 455 nm. However, its discrimination in hyperspectral image endmembers such as the AHS because of lack of coincidence with the AHS spectral range. The use of other significant bands, particularly those resulting from the statistical testing of mussel and oyster with other benthic cover types (e.g., seaweed, cockle), may offer an alternative. The 600 to 700 nm range, or the red-edge region, may be used to discriminate among all benthic cover types. The simulation of varying observation geometries was performed to determine how mussel and oyster spectra are affected by various viewing and illumination angles. The results showed that the mussel and oyster spectra remain distinct, although their reflectance values were affected as the viewing angle and solar azimuth angle increased. The image quality of the AHS was assessed to test its potential to detect mussel and oyster spectra. However, the radiometric, geometric, and atmospheric properties were found to be insufficient to map the shellfish spectra. Moreover, the statistically significant bands between 350-455 nm did not coincide with the AHS image. Due to limited time, the recommendations of this study include further statistical analysis on the mussel and oyster spectra, particularly, through the J-M separability test. The use of a well-designed goniometer is also strongly recommended for the simulation of varying in-situ conditions. Finally, the use of the recalibrated AHS images or other hyperspectral images may deem more useful in detecting mussel and oyster spectra, provided that the image requirements for remotely sensing moisture-rich environments are satisfied. In conclusion, further knowledge on the spectral distinctness of mussels and oysters is needed and further analytical steps should be made in order to answer whether mussels and oysters can be spectrally discriminated in hyperspectral imagery.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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