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Bookmark or Share- Atmosphere - EarthdataFind Data. Earth’s atmosphere is a thin veil of gas surrounding the planet. Although it only extends a few hundred kilometers above the surface, it contains a mixture of gases, such as oxygen and nitrogen, that are critical for life to exist. It distributes incoming solar radiation, protecting life from harmful ultraviolet radiation but also ...
- Synthetic Aperture Radar | NASA EarthdataSynthetic aperture radar (SAR) is a type of active data collection where an instrument sends out a pulse of energy and then records the amount of that energy reflected back after it interacts with Earth. Unlike optical imagery, which is a passive data collection technique based on emitted energy, SAR imagery is created from the reaction of an ...
- On the Trail of Contrails | NASA EarthdataOn the Trail of Contrails. Clouds from aircraft exhaust can blanket the sky. Most people have, at some point in their lives, lain on their backs and gazed up at the sky, scouting for clouds that look like puppies or leaping dolphins. Scientists Sarah Bedka and Douglas Spangenberg scan the skies for thin white lines that could be contrails.
- Lidar | NASA EarthdataLidar stands for Light Detection and Ranging. It is a remote sensing method that uses light in the form of a pulsed laser to measure ranges. Lidar is the optical analogue of radar. Lidar differs from radar in its energy source, a laser in the optical part of the electromagnetic spectrum (near IR and green). Lidar is used to measure things such as: range and altitude atmospheric vertical ...
- Remote Sensing | NASA EarthdataRemote sensing is the acquiring of information from a distance. NASA observes Earth and other planetary bodies via remote instruments on space-based platforms (e.g., satellites or spacecraft) and on aircraft that detect and record reflected or emitted energy. Remote instruments, which provide a global perspective and a wealth of data about ...
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