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. doi:10.3390/rs5116116


Author Joyce, Karen E.
Phinn, Stuart R.
Roelfsema, Chris M.
Title Live Coral Cover Index Testing and Application with Hyperspectral Airborne Image Data
Journal name Remote Sensing   Check publisher's open access policy
ISSN 2072-4292
Publication date 2013-11
Year available 2013
Sub-type Article (original research)
DOI 10.3390/rs5116116
Open Access Status DOI
Volume 5
Issue 11
Start page 6116
End page 6137
Total pages 22
Place of publication Basel, Switzerland
Publisher M D P I AG
Collection year 2014
Language eng
Formatted 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.
Keyword Live coral
Spectral index
Band ratios
Image Processing
Hyperspectral
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2014 Collection
 
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