Elements Of Remote Sensing
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Reduces the contrast of the image and also its sharpness
Reduces the contrast but increases the sharpness
Increases the contrast of the image but reduces the sharpness
Increases both the contrast and sharpness

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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
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
The off-nadir resolution is degraded

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