High-resolution ground verification, cluster analysis and optical model of reef substate coverage on Landsat TM imagery (Red Sea, Egypt)

S.J. Purkis, J.A.M. Kenter, E.K. Oikonomou, I.S. Robinson

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    A combination of high-resolution ground verification, cluster analysis using Landsat Thematic Mapper (TM) data, and optical modelling, was applied to Red Sea reef substrate. Ground verification, in an area of 3 by 20 pixels (90 by 600 m) with one metre scale resolution, identified the presence of 30 different bottom types that were later reduced to twelve dominant bottom types. A combination of bispectral plots and principal component analysis using spectral bands 1, 2 and 3 confirmed the presence of nine bottom types. The identified clusters were separated and used as a training set to classify substrate. Optical modelling, using literature radiance values and coverage of the original twelve dominant bottom types and a simple model for atmospheric and water column absorption, revealed a difference of up to 60 W m
    Original languageEnglish
    Pages (from-to)1677-1698
    Number of pages21
    JournalInternational Journal of Remote Sensing
    Volume23
    DOIs
    Publication statusPublished - 2002

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