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As the Earth rotates to the east beneath the satellite, each pass of the satellite monitors a narrow area running from north to south, to the west of the previous pass. These 'strips' can be pieced together to produce a picture of a larger area. Polar satellites circle at a much lower altitude than geostationary satellites - at about 850 km. This means that polar satellites can photograph closer up than the high altitude geostationary satellites.Polar satellites, therefore, provide more detailed information about violent storms and cloud systems. |
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