The Technology Guides provide an overview of the different satellite missions.
Information services supporting disaster management comprise weather forecasting, remote sensing, geo-positioning, navigation, television and telecommunication. They all rely, to various degrees, on space-based infrastructure and space technology. Instruments onboard satellites circling the Earth make use of the spectrum of electromagnetic radiation, in specific ranges of wavelength, for observation and imaging, atmospheric sounding, radio communication, geo-positioning and navigation.
In terms of spatial position they take advantage of different orbits. A satellite in a Geostationary Orbit circles the Earth above the equator (0° latitude) synchronously to the Earth's rotation. Its apparently fixed position in an altitude of more than 35,000 km makes it suitable for communication signal transponding, and regional weather observation with high temporal but low spatial resolution. Earth observation and weather satellites in Low Earth Orbit at an altitude of typically about 500-800 km and near polar inclination provide global coverage with comparatively lower temporal, but medium to very high spatial resolution. For reasons of space transport costs, constellations of communication or navigation satellites are also placed in Low Earth Orbit.
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