Spectral index development for mapping live coral cover

Joyce, Karen E. and Phinn, Stuart R. (2013) Spectral index development for mapping live coral cover. Journal of Applied Remote Sensing, 7 1: 073590.1-073590.20. doi:10.1117/1.JRS.7.073590

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Author Joyce, Karen E.
Phinn, Stuart R.
Title Spectral index development for mapping live coral cover
Journal name Journal of Applied Remote Sensing   Check publisher's open access policy
ISSN 1931-3195
Publication date 2013-02
Sub-type Article (original research)
DOI 10.1117/1.JRS.7.073590
Open Access Status File (Publisher version)
Volume 7
Issue 1
Start page 073590.1
End page 073590.20
Total pages 20
Place of publication Bellingham, WA, United States
Publisher S P I E - International Society for Optical Engineering
Collection year 2014
Language eng
Abstract Remotely sensed spectral indices are used in a range of environments for estimating properties of vegetation, soil, atmospheric, and water features. Here, the development of an index sensitive to the amount of live coral, using in situ spectral reflectance data from Australia and Hawaii is outlined. From an initial spectral reflectance library of common reef benthic features, linear spectral mixing was used to create mixed reflectance signatures that represented image pixels in a reef environment. The correlation between the proportion of total live coral and the mixed reflectance signal at each wavelength was calculated to determine the wavelengths sensitive to variations in the amount of live coral. First and second derivatives of the reflectance spectra, in addition to simple band ratios, were also tested. The same processing and analysis procedures were then followed after simulating the spectral mixtures under different depths and levels of suspended organic content using a radiative transfer model (Hydrolight 4.1). Results show that the second derivative of reflectance at 564 nm was one of the wavelength regions most sensitive to variations in live coral cover and least sensitive to variations in water depth and quality. Subsequent research will present the applicability of this technique to hyperspectral image data.
Keyword Coral reef
Hyperspectral
Live coral cove
Spectral index
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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