“The immediate and frequent flow of images from —- allows cartographers to create detailed and relevant maps to estimate constant and changing environmental conditions, such as sediment buildup, air pollution, ocean surface roughness, surface temperatures, biomass volumes, mineral resources, and changes created by storms and floods.”

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“Made up of a network of satellites and receiving instruments, — provides an accurate location with respect to latitude, longitude, and even altitude. — technology in the United States relies on a system of 24 satellites that make 6 full orbits around the Earth every 12 hours. The European Union, as well as some individual countries such as Russia and China, have their own satellites that support — systems.”

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“In a process called –, a GPS receiver measures the precise time taken for radio signals from four or more satellites to travel to the receiver. The receiver then multiplies the time by the speed of a radio wave to calculate the distance between it and the satellite. When signals from the four or more satellites are processed in the same manner, the receiver’s built-in computer determines the point at which at least four satellite signals intersect on the Earth. This intersection then identifies the receiver’s latitude, longitude, and altitude. The more satellites that are used, the more accurate the location that is pinpointed.”

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