Elements Of Remote Sensing
Geodimeter is based on:

Propagation of modulated light waves
High frequency radio waves
Propagation of infrared radiation
The visible light as carrier with frequency of the order of 5 × 1014 Hz

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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
Constant solar zenith angles and similar illumination conditions
All of these
Synoptic view of a large area

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