In the marine environment, remote sensing provides data for a wide variety of environmental variables (Table 4). Optical remote-sensing methods are commonly used to map the ocean-land interface and coral reefs. Methods
Table 3 Information about the atmosphere derived from remote sensing
Aerosol loading and size distribution over oceans
Aerosol content and optical thickness over land
Water vapor (precipitable water)
Cloud optical thickness
Cloud top temperature and height
Cloud particle phase
Cloud particle radius
Total-column ozone content
Atmospheric wind and temperature profiles
Table 4 Information about marine ecosystems derived from remote sensing
Sea surface temperature Ocean color (productivity) Coral reef mapping Ocean surface topography Oil slick detection and mapping Ocean circulation Wind speed and direction Fluorescence used for these applications are similar to those used for terrestrial land cover mapping except there is greater use of the short-wavelength blue bands for coral reef mapping since those wavelengths are better able to penetrate into the water to provide more information on features several meters under the water surface.
Two other common global marine data sets are sea surface temperature, which is derived using methods similar to those used for land temperature, and ocean color which uses optical imagery to determine levels of phytoplankton in the water. Both of these data sets are acquired on a daily basis.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.