Elements Of Remote Sensing
Which one of the following residual biases involves the GPS accuracy?

Signal propagation biases due to the sphere and troposphere propagation
Receiver-dependent biases due to clock stability with line
Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
All listed here

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

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Elements Of Remote Sensing
Earth observations from a satellite platform provide:

All of these
Synoptic view of a large area
Constant solar zenith angles and similar illumination conditions
Repetitive observations of the same area with intervals of a few minutes to a few weeks

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