Elements Of Remote Sensing
Electromagnetic spectrum contains:

All of these
Infrared rays (wave length < 10⁻⁴ m)
Ultraviolet rays (wave length < 10⁻⁶ m)
Gamma rays (wave length < 10⁻¹⁰ m)

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

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