Elements Of Remote Sensing
If flying height of a spacecraft is H, the length of air base is B and the parallax difference between two points is dp, then the difference in height

h = dp/(H/B)
h = (H/B) dp
h = dp/(B/H)
h = (B/H) dp

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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
All of these
The off-nadir resolution is degraded

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