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GLOSSARY

Our comprehensive glossary is available to assist in your understanding of the S'COOL lesson plan vocabulary words. Please select the first letter of the word you wish to check for a definition and further information.

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All definitions

G
Geostationary Orbits:
A geostationary (GEO=geosynchronous) orbit is one in which the satellite is always in the same position with respect to the rotating Earth. The satellite orbits at an elevation of approximately 35,790 km because that produces an orbital period (time for one orbit) equal to the period of rotation of the Earth (23 hrs, 56 mins, 4.09 secs). By orbiting at the same rate, in the same direction as Earth, the satellite appears stationary (synchronous with respect to the rotation of the Earth). Geostationary satellites provide a "big picture" view, enabling coverage of weather events. This is especially useful for monitoring severe local storms and tropical cyclones. Because a geostationary orbit must be in the same plane as the Earth's rotation, that is the equatorial plane, it provides distorted images of the polar regions with poor spatial resolution. .   For more information on orbits.
G
Global Warming:
Describes the average global surface temperature increase from human emissions of greenhouse gases.   Global Warming vs. Climate Change
G
graph:
A visual representation of a particular data set.   Bar Graph
Image courtesy Nasa S'COOL Project
G
gravity:
a physical force that is responsible for the force of attraction between any two bodies that have mass. The Earth's gravity is what keeps us from floating into space.  
G
Green:
To become conscious of how your actions affect the environment and to make lifestyle decisions with the environment in mind.  
G
Greenwich Mean Time:
Standard time at longitude = 0 (the longitude line which goes through Greenwich, England) which is used as a standard around the world to assist in synchronizing data collection..   Look here to figure out the time offset from UT to your time zone.
G
ground truth:
an observation where a person on the ground (or sometimes in an airplane) makes a measurement of the same event or quantity that a satellite is trying to measure, at the same time the satellite is measuring it. The two measurements are then compared to help evaluate how well the satellite instrument is performing.  

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