Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

Constant in time
Constant in time and space
None of these
Constant in space

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

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

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