Elements Of Remote Sensing
The various stages occuring in GPS system are described below:
1. Generation of an output to the user
2. Detection of the GPS signals
3. Processing the data in the built-in-computer
4. Decoding the GPS signal.
The correct sequence of the stages is:

2, 4, 3, 1
2, 3, 4, 1
1, 2, 3, 4
3, 1, 2, 4

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

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