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 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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Elements Of Remote Sensing
The part radiation due to scattered/diffused radiation entering the field of view of a remote sensor other than that from the required target,

Increases the contrast of the image but reduces the sharpness
Reduces the contrast but increases the sharpness
Increases both the contrast and sharpness
Reduces the contrast of the image and also its sharpness

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