Roelfsema, Christiaan M; Phinn, Stuart R (2013): Spectral reflectance library of selected biotic and abiotic coral reef features in Glovers Reef, Belize [dataset]. Biophysical Remote Sensing Group, Centre for Spatial Environmental Research, University of Queensland, Australia, PANGAEA, https://doi.org/10.1594/PANGAEA.824861
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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.
Related to:
Roelfsema, Christiaan M; Marshall, John; Phinn, Stuart R; Joyce, Karen (2006): Underwater Spectrometer System 2006 (UWSS04) - Manual. Biophysical Remote Sensing Group, Centre for Spatial Environmental Research, University of Queensland, Australia, 28 pp, hdl:10013/epic.40554.d003
Roelfsema, Christiaan M; Phinn, Stuart R (2013): GPS linked target-photos of benthic cover surveys in Glovers Reef, Belize [dataset]. Biophysical Remote Sensing Group, Centre for Spatial Environmental Research, University of Queensland, Australia, PANGAEA, https://doi.org/10.1594/PANGAEA.824860
Coverage:
Median Latitude: 16.742100 * Median Longitude: -87.810033 * South-bound Latitude: 16.728600 * West-bound Longitude: -87.831700 * North-bound Latitude: 16.754400 * East-bound Longitude: -87.785300
Date/Time Start: 2005-03-06T14:30:00 * Date/Time End: 2005-03-10T14:00:00
Minimum Elevation: -6.5 m * Maximum Elevation: -5.0 m
Event(s):
GloversReef_1 * Latitude: 16.754400 * Longitude: -87.785300 * Date/Time Start: 2005-03-09T12:00:00 * Date/Time End: 2005-03-10T14:00:00 * Elevation: -6.5 m * Location: Belize, Glovers Reef, Long Cay * Method/Device: Sampling by diver (DIVER)
Comment:
Operator: Chris Roelfsema, Giancarlo Cesarello; Analyser: Chris Roelfsema; Identification: Chris Roelfsema, Alan Lim; Spectrometer: Ocean Optics 2000; Fibre Optic Cable Thickness: 400 µm; Integration time: 80 ms; Distance to subject: 5 cm; Light souce: Dive Torch; Number of spectra: 8; Dark pixel: 1; White panel: 1; Processing of reflectance: reflectance = average over 10 wavebands of 8 averaged samples of ((Target-Dark)/(White-Dark)).
See "Related to:" for photos of individual benthic type targets from which reflectance was measured.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Date/Time of event | Date/Time | ||||
| 3 | Latitude of event | Latitude | ||||
| 4 | Longitude of event | Longitude | ||||
| 5 | Elevation of event | Elevation | m | |||
| 6 | Image number/name | Image no/name | Roelfsema, Christiaan M | |||
| 7 | Wavelength | Lambda | nm | Roelfsema, Christiaan M | ||
| 8 | Reflectance, total | Refl tot | Roelfsema, Christiaan M | Spectrophotometer, Ocean Optics USB2000 | ||
| 9 | Comment | Comment | Roelfsema, Christiaan M | Target Info |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
512032 data points
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