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

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

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Elements Of Remote Sensing
Due to scan geometry of a satellite sensor:

The details towards the edge of the scan get compressed
The off-nadir resolution is degraded
All of these
The ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir

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