Serge Andréfouët

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Coral reef benthic communities are mosaics of individual bottom-types that are distinguished by their taxonomic composition and functional roles in the ecosystem. Knowledge of community structure is essential to understanding many reef processes. To develop techniques for identification and mapping of reef bottom-types using remote sensing, we measured(More)
Spectral reflectance (R) of corals is a fundamental parameter to coral reef remote sensing. We explore general trends as well as geographic and taxonomic variabilities of coral R using a data set consisting of 5,199 R’s measured in situ at depths of up to 15 m for 195 coral colonies at 11 sites worldwide. Coral R ranges in magnitude from ~0.5% at 400 nm to(More)
Serge Andréfouët*, Philip Kramer, Damaris Torres-Pulliza, Karen E. Joyce, Eric J. Hochberg, Rodrigo Garza-Pérez, Peter J. Mumby, Bernhard Riegl, Hiroya Yamano, William H. White, Mayalen Zubia, John C. Brock, Stuart R. Phinn, Abdulla Naseer, Bruce G. Hatcher, Frank E. Muller-Karger a Institute for Marine Remote Sensing, College of Marine Science, University(More)
Bleached corals provide a strong optical signal that suggests that remote sensing investigations of major bleaching events are feasible using airborne or satellite sensors. However, patchy coral cover, varying intensities of bleaching, and water depths are likely to limit the application of remote sensing techniques in monitoring and mapping coral(More)
The feasibility of using hydrodynamic renewal time as the basis for a classification of atoll lagoons is tested for atolls of the Tuamotu Archipelago, French Polynesia. Renewal time depends on the inflow of oceanic water through the rim of the atoll, on a daily time scale, due to wave forcing. Renewal time is computed for a large set of morphologically(More)
Spatial relationships among image objects play a vital role in countless domains of computer vision (e.g., pattern recognition, image understanding, scene description). Some have received considerable attention the last few years (e.g., “to the right of,” “above,” “to the left of” and “below”), but others have not been the subject of as much investigation.(More)
A large river plume generated by anomalous precipitation and oceanic circulation associated with Hurricane Mitch was detected off Honduras in October 1998 using SeaWiFS ocean color images. This event provides the background for analyzing connectivity between coral reefs and land in the Meso-American reef system. We discuss the potential implications of such(More)
An examination of IKONOS satellite imagery of the Keppel Islands (Great Barrier Reef) acquired before and during a coral bleaching event indicates that severe bleaching of reefs can be detected as an increase in brightness in the band 1 (blue) and band 2 (green) IKONOS spectral bands (4-m resolution). The bleaching was not detected in band 3 (red), band 4(More)