Elements Of Remote Sensing
Electromagnetic spectrum contains:

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

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

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

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