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Mapping coral reef benthos, substrates, and bathymetry, using compact airborne Spectrographic Imager (CASI) data

Leiper, Ian A., Phinn, Stuart R., Roelfsema, Chris M., Joyce, Karen E. and Dekker, Arnold G. (2014). Mapping coral reef benthos, substrates, and bathymetry, using compact airborne Spectrographic Imager (CASI) data. Remote Sensing,6(7):6423-6445.

Document type: Journal Article
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IRMA ID 84376995xPUB42
Title Mapping coral reef benthos, substrates, and bathymetry, using compact airborne Spectrographic Imager (CASI) data
Author Leiper, Ian A.
Phinn, Stuart R.
Roelfsema, Chris M.
Joyce, Karen E.
Dekker, Arnold G.
Journal Name Remote Sensing
Publication Date 2014
Volume Number 6
Issue Number 7
ISSN 2072-4292   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84904480039
Start Page 6423
End Page 6445
Total Pages 23
Place of Publication Switzerland
Publisher MDPIAG
Abstract This study used a reef-up approach to map coral reef benthos, substrates and bathymetry, with high spatial resolution hyperspectral image data. It investigated a physics-based inversion method for mapping coral reef benthos and substrates using readily available software: Hydrolight and ENVI. Compact Airborne Spectrographic Imager (CASI) data were acquired over Heron Reef in July 2002. The spectral reflectance of coral reef benthos and substrate types were measured in-situ, and using the HydroLight 4.2 radiative transfer model a spectral reflectance library of subsurface reflectance was simulated using water column depths from 0.5-10.0 m at 0.5 m intervals. Using the Spectral Angle Mapper algorithm, sediment, benthic micro-algae, algal turf, crustose coralline algae, macro-algae, and live coral were mapped with an overall accuracy of 65% to a depth of around 8.0 m; in waters deeper than 8.0 m the match between the classified image and field validation data was poor. Qualitative validation of the maps showed accurate mapping of areas dominated by sediment, benthic micro-algae, algal turf, live coral, and macro-algae. A bathymetric map was produced for water column depths 0.5-10.0 m, at 0.5 m intervals, and showed high correspondence with in-situ sonar data (R2 value of 0.93).
Keywords CASI
Coral reef
Hyperspectral
Remote sensing
Spectral angle mapper
DOI http://dx.doi.org/10.3390/rs6076423   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Description for Link Link to CC Attribution 3.0 License
URL https://creativecommons.org/licenses/by/3.0/au/legalcode


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