Serge Andréfouët

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21 Abstract 22 Ten IKONOS images of different coral reef sites distributed around the world were processed to assess the potential of 4-m resolution 23 multispectral data for coral reef habitat mapping. Complexity of reef environments, established by field observation, ranged from 3 to 15 24 classes of benthic habitats containing various combinations of(More)
Which populations are replenished primarily by immigrants (open) and which by local production (closed) remains an important question for management with implications for response to exploitation, protection, and disturbance. However, we lack methods for predicting population openness. Here, we develop a model for openness and show that considering habitat(More)
The aim of this study is the development of tools dedi-stage, although commonly overlooked (Hammond and Verbyla, 1996). Evaluating a partition generally consists cated to fuzzy partition evaluation in the field of satellite image classification. While a traditional crisp partition of comparing it with a control partition and measuring only provides(More)
The design of automatic systems dedicated to satellite image classification has received considerable attention. However, the current systems still cannot compare with human photo-interpreters. A promising approach consists in integrating structural knowledge into the classification process, i.e., using information about the shape of and the spatial(More)
Is it possible to derive accurately Total Suspended Matter concentration or its proxy, turbidity, from remote sensing data in tropical coastal lagoon waters? To investigate this question, hyperspectral remote sensing reflectance, turbidity and chlorophyll pigment concentration were measured in three coral reef lagoons. The three sites enabled us to get data(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(More)
Beyond the loss of species richness, human activities may also deplete the breadth of evolutionary history (phylogenetic diversity) and the diversity of roles (functional diversity) carried out by species within communities, two overlooked components of biodiversity. Both are, however, essential to sustain ecosystem functioning and the associated provision(More)
The Government of Madagascar plans to increase marine protected area coverage by over one million hectares. To assist this process, we compare four methods for marine spatial planning of Madagascar's west coast. Input data for each method was drawn from the same variables: fishing pressure, exposure to climate change, and biodiversity (habitats, species(More)
Seagrass meadows cover about 0.05-0.15% of the world's ocean and are some of the most productive systems on Earth. Direct and indirect human-derived impacts have led to significant seagrass declines worldwide and the alteration of services linked to their biodiversity. Effective conservation and the provision of sustainable recovery goals for ecologically(More)