Elements Of Remote Sensing
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

Five ground stations
Three ground stations
Four ground stations
Six ground stations

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Elements Of Remote Sensing
Earth observations from a satellite platform provide:

Synoptic view of a large area
Repetitive observations of the same area with intervals of a few minutes to a few weeks
All of these
Constant solar zenith angles and similar illumination conditions

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