Elements Of Remote Sensing
Remote sensing techniques make use of the properties of ___________ emitted, reflected or diffracted by the sensed objects:

Electromagnetic waves
Electric waves
Wind waves
Sound waves

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

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

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