Elements Of Remote Sensing
Pick up the important characteristic of a target which facilitates its identification from the following:

All of these
Spatial variation
Temporal variation
Spectral variation

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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
Repetitive observations of the same area with intervals of a few minutes to a few weeks
Synoptic view of a large area

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