As noted earlier, the extent and variability of seasonal snow cover are important parameters in large-scale climate and hydrologic systems. Satellite remote sensing offers the opportunity to monitor and evaluate various snow parameters and processes at regional to global scales (Hall and Martinec, 1985; Hall etal., 2005). This section describes the types of satellite remote sensing currently being applied to snow-cover studies. Similar sensor configurations are typically available for aircraft use but this section concentrates on data from polar orbiting satellites because of the potential for monitoring snow cover at the hemispheric to global scale with daily or near-daily spatial coverage. More importantly, a few of the data sets described below provide a time series of sufficient length to evaluate climate patterns and climate change.
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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.