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Spectral reflectance library of selected biotic and abiotic coral reef features in Glovers Reef, Belize

By Christiaan M Roelfsema and Stuart R Phinn

Abstract

Underwater spectral reflectance was measured for selected biotic and abiotic coral reef features of Glovers Reef, Belize from March 6 - 10, 2005. Spectral reflectance's of 63 different benthic types were obtained in-situ. An Ocean Optics USB2000 spectrometer was deployed in an custom made underwater housing with a 0.5 m fiber-optic probe mounted next to an artificial light source. Spectral readings were collected with the probe (bear fibre) about 5 cm from the target to ensure that the target would fill the field of view of the fiber optic (FOV diameter ~4.4 cm), as well as to reduce the attenuating effect of the intermediate water (Roelfsema et al., 2006). Spectral readings included for one target included: 1 reading of the covered spectral fibre to correct for instrument noise, 1 reading of spectralon panel mounted on divers wrist to measure incident ambient light, and 8 readings of the target. Spectral reflectance was calculated for each target by first subtracting the instrument noise reading from each other reading. The corrected target readings were then divided by the corrected spectralon reading resulting in spectral reflectance of each target reading. An average target spectral reflectance was calculated by averaging the eight individual spectral reflectance's of the target. If an individual target spectral reflectance was visual considered an outlier, it was not included in the average spectral reflectance calculation. See Roelfsema at al. (2006) for additional info on the methodology of underwater spectra collection

Topics: Belize, Glovers Reef, Long Cay; Belize, Glovers Reef, Long Cay Cervicornis site; Belize, Glovers Reef, PIF; Comment; Date/Time of event; DIVER; Elevation of event; Event label; GloversReef_1; GloversReef_2; GloversReef_3; Image number/name; Latitude of event; Longitude of event; Reflectance, total; Sampling by diver; Spectrophotometer, Ocean Optics USB2000; Wavelength
Publisher: PANGAEA
Year: 2013
DOI identifier: 10.1594/PANGAEA.824861
OAI identifier: oai:pangaea.de:doi:10.1594/PANGAEA.824861
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