Spectral reflectance of coral reef benthos and substrate assemblages on Heron Reef, Australia

Ian Leiper, Stuart Phinn, Arnold Dekker

    Research output: Contribution to journalArticle

    Abstract

    Studies investigating the spectral reflectance of coral reef benthos and substrates have focused on the measurement of pure endmembers, where the entire field of view (FOV) of a spectrometer is focused on a single benthos or substrate type. At the spatial scales of the current satellite sensors, the heterogeneity of coral reefs even at a sub-metre scale means that many individual image pixels will be made up of a mixture of benthos and substrate types. If pure endmember spectra are used as training data for image classification, there is a spatial discrepancy, because many pixels will have a mixed endmember spectral reflectance signature. This study investigated the spectral reflectance of coral reef benthos and substrates at a spatial scale directly linked to the pixel size of high spatial resolution imaging systems, by incorporating multiple benthos and substrate types into the spectrometer FOV in situ. A total of 334 spectral reflectance signatures were measured of 19 assemblages of the coral reef benthos and substrate types. The spectra were analysed for separability using first derivative values, and a discrimination decision tree was designed to identify the assemblages. Using the decision tree, it was possible to identify 15 assemblages with a mean overall classification accuracy of 62.6%.
    Original languageEnglish
    Pages (from-to)3946-3965
    Number of pages20
    JournalInternational Journal for Remote Sensing
    Volume33
    Issue number12
    DOIs
    Publication statusPublished - 2012

    Fingerprint Dive into the research topics of 'Spectral reflectance of coral reef benthos and substrate assemblages on Heron Reef, Australia'. Together they form a unique fingerprint.

    Cite this