Elements Of Remote Sensing
Geodimeter is based on:

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

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Elements Of Remote Sensing
Which one of the following statement is incorrect regarding the electromagnetic radiation?

The changing electric fields induce the changing magnetic fields in the surrounding medium
These are produced by the motion of electric charge
The oscillation of charged particles sets up changing electric fields
None of these

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Elements Of Remote Sensing
Which one of the following parameters is accurate for DGPS?

Positional accuracies ~ 2 - 5 m if rover is less than 2-5 km from the reference station
Positional accuracies ~ 5 - 10 m if rover is less than 25 km
Positional accuracies ~ 1 - 2 m if rover is less than 1-2 km from the reference station
Positional accuracies ~ 5 - 10 m if rover is less than 5-10 km from reference station

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