Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

Constant in time
Constant in time and space
None of these
Constant in space

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

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

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