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Live Coral Cover Index Testing and Application with Hyperspectral Airborne Image Data

Joyce, Karen E., Phinn, Stuart R. and Roelfsema, Chris M. (2013). Live Coral Cover Index Testing and Application with Hyperspectral Airborne Image Data. Remote Sensing,5(11):6116-6137.

Document type: Journal Article
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IRMA ID 82057923xPUB596
Title Live Coral Cover Index Testing and Application with Hyperspectral Airborne Image Data
Author Joyce, Karen E.
Phinn, Stuart R.
Roelfsema, Chris M.
Journal Name Remote Sensing
Publication Date 2013
Volume Number 5
Issue Number 11
ISSN 2072-4292   (check CDU catalogue open catalogue search in new window)
eISSN 2072-4292
Scopus ID 2-s2.0-84904502142
Start Page 6116
End Page 6137
Total Pages 22
Place of Publication Switzerland
Publisher MDPIAG
HERDC Category C1 - Journal Article (DIISR)
Abstract Coral reefs are complex, heterogeneous environments where it is common for the features of interest to be smaller than the spatial dimensions of imaging sensors. While the coverage of live coral at any point in time is a critical environmental management issue, image pixels may represent mixed proportions of coverage. In order to address this, we describe the development, application, and testing of a spectral index for mapping live coral cover using CASI-2 airborne hyperspectral high spatial resolution imagery of Heron Reef, Australia. Field surveys were conducted in areas of varying depth to quantify live coral cover. Image statistics were extracted from co-registered imagery in the form of reflectance, derivatives, and band ratios. Each of the spectral transforms was assessed for their correlation with live coral cover, determining that the second derivative around 564 nm was the most sensitive to live coral cover variations(r2 = 0.63). Extensive field survey was used to transform relative to absolute coral cover, which was then applied to produce a live coral cover map of Heron Reef. We present the live coral cover index as a simple and viable means to estimate the amount of live coral over potentially thousands of km2 and in clear-water reefs.
Keywords Live coral
Spectral index
Band ratios
Image processing
Hyperspectral
Field survey
Remote sensing
CASI
DOI http://dx.doi.org/10.3390/rs5116116   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Open access True
Additional Notes This is an Open Access article distributed under the terms of the Creative Commons Attribution License 3.0, 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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