Integrating in situ reef-top reflectance spectra with Landsat TM imagery to aid shallow-tropical benthic habitat mapping

Sam Purkis, R. Pasterkamp

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

This manuscript presents the use of hyperspectral in situ reflectance measurements evaluated above the water surface to train a supervised classification of a simultaneously acquired Landsat 5 TM image. The optical signature of a submerged reef substrate is both attenuated and augmented by the presence of the atmosphere and intervening water column, thereby complicating the link between field and space-borne measurement. The motivation of this manuscript is to quantify the advantage (defined as increase in classification accuracy) conferred by each of five levels of increasingly complex image processing methods to correct for atmospheric and submergence effects. It is found that the maximum overall classification accuracy attained in areas of the image where water depth is unknown was 53%, but with the addition of depth information, accuracy increases to 76%. The results demonstrate the ability of a classifier trained solely by in situ optical measurements to accurately resolve the broad substrate types of a typical Red Sea fringing reef top. Although slightly different accuracy assessment protocols were used, the results also suggest that using in situ spectra for training provided better classification results than using from-image statistics.

Original languageEnglish (US)
Pages (from-to)5-20
Number of pages16
JournalCoral Reefs
Volume23
Issue number1
DOIs
StatePublished - Apr 1 2004
Externally publishedYes

Fingerprint

Landsat
Landsat thematic mapper
reflectance
reefs
reef
imagery
habitat
habitats
substrate
fringing reef
accuracy assessment
submergence
image classification
image processing
train
water
Red Sea
water depth
water column
processing technology

Keywords

  • Classification
  • Habitat mapping
  • In situ spectra
  • Landsat
  • Radiative transfer
  • Red Sea

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Integrating in situ reef-top reflectance spectra with Landsat TM imagery to aid shallow-tropical benthic habitat mapping. / Purkis, Sam; Pasterkamp, R.

In: Coral Reefs, Vol. 23, No. 1, 01.04.2004, p. 5-20.

Research output: Contribution to journalArticle

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