Multi-Site Evaluation of IKONOS Data fir Classification of Tropical Coral Reef Environments

Coral reef IKONOS images consisting of multispectral data having a resolution of 4 meters were obtained from ten sites at various locations around the world. Field observations of the benthic habitats showed that seagrass, algae, corals, and sediment were present in various combinations and that fou...

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Veröffentlicht in:Remote sensing of environment 2003-11, Vol.88 (1), p.128-128
Hauptverfasser: Andrefouet, Serge, Kramer, Philip, Torres-Pulliza, Damaris, Joyce, Karen E, Hochberg, Eric J, Garza-Perez, Rodrigo, Mumby, Peter J
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Sprache:eng
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Zusammenfassung:Coral reef IKONOS images consisting of multispectral data having a resolution of 4 meters were obtained from ten sites at various locations around the world. Field observations of the benthic habitats showed that seagrass, algae, corals, and sediment were present in various combinations and that four geomorpholigic zones were represented. The number of benthic habitats ranged from three to 15. Images were classified and compared to images from Landsat 7 that had already been classified and to field findings. Results showed that as the complexity of benthic habitats increased, accuracy of classification decreased. When four or five benthic habitats were present, IKONOS imagery correctly classified them 77% of the time. Whereas, when there were more than 13 benthic habitats, classification accuracy dropped to 53%. However, IKONOS accuracy was 15 to 20% more accurate than classifications from Landsat images. Accuracy can be improved when presegmentation of the reef into zones is possible.
ISSN:0034-4257