Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery
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This European Space Agency Envisat MERIS image of the Great Barrier Reef off Australia's Queensland coast, centered on Cape York Peninsula, was acquired on Aug. 19, 2004.

Scientists used satellite imagery to create a set of high-resolution 3-D maps of the entire Great Barrier Reef, a critical step toward identifying, managing and protecting the giant ecosystem.

Sitting off the east coast of Australia, the Great Barrier Reef is the world’s largest coral reef system, covering more than 344 000 square kilometers. The reef’s diversity of life faces numerous threats, including climate change, pollution, fishing and outbreaks of the coral-preying crown-of-thorns starfish.

While these coral reefs are ecologically significant, they have proven difficult to map from survey vessels or aircraft owing to their shallow nature and remoteness. The German aquatic remote sensing company EOMAP has used satellites to overcome these hurdles. The result is the largest project of its kind ever conducted in Australia: a high-resolution, 3-D map of the entire reef system.

To produce the map, the company combined satellite optical imagery with tide information and existing ocean floor topography data. High-resolution optical satellite data are best suited for clear water to depths of 20 meters under calm weather conditions.

Image courtesy of European Space Agency.

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