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

Four ground stations
Five ground stations
Six ground stations
Three 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
Constant solar zenith angles and similar illumination conditions
All of these

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Elements Of Remote Sensing
According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n₁) on another medium (refractive index m₂);

The angle of incidence is equal to the angle of refraction
Both (A) and (B)
Neither (A) nor (B)
The angle of refraction (θr) is given by sin θ₂ = (n₁/n₂) sin θi

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Elements Of Remote Sensing
‘A’ and ‘B’ are two towers of equal height diametrically opposite on either side of the nadir point, at 3 km and 5 km distances. Which one of the following statements is correct?

Height displacement of A and B is equal
Height displacement of A and B will be towards each other
Height displacement of A will be less than that of B
Height displacement of B will be less than that of A

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