http://coralreefs.wr.usgs.gov/mapping_lidar.html
This LIDAR, or light detection and ranging maps are a type of active remote sensing, which produces its own electromagnetic radiation. It uses lasers instead of radio or microwave radiation. This particular map shows the coral reefs in South Moloka‘i in order to keep track of growth and see how hurricanes have been effecting them. It shows a large hole in the reef.
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