Elements Of Remote Sensing
The optical property of a water body depends on:

Scattering by the suspended particulate matter
Absorption by the suspended particulate matter
Absorption by the dissolved material
All of these

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

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

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