The different shades in these images highlight various features specific to each coral colony. Patches of bright red show places where coral reefs are actively populated with living organisms.
Near infrared data makes some areas on the reef jump out in bright red relief. The near infrared band best gathers the electromagnetic signature of a thriving ecosystem.
Located in tropical latitudes, the hard structures we know as coral are really the incremental build-ups of calcium carbonate deposited from the skeletal remains of these tiny colonial animals.
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