Elements Of Remote Sensing
A perfectly black body:

Absorbs all the radiations of every wave lengths
Is a diffuse emitter
Emits power of every wave length
All listed here

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

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

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