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). pp. 6116-6137.

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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(r^2 = 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 km^2 and in clear-water reefs.

Item ID: 40842
Item Type: Article (Refereed Research - C1)
Additional Information:

© 2013 by the authors. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license.

ISSN: 2072-4292
Funders: University of Queensland, Australian Research Council, CSIRO Land and Water, World Bank Global Environmental Fund
Date Deposited: 27 Oct 2015 04:00
FoR Codes: 09 ENGINEERING > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing @ 70%
05 ENVIRONMENTAL SCIENCES > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified @ 30%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 100%
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