Direct Methods
Sensors that measure atmospheric constituents directly such as thermometers, barometers and humidity sensors can be sent aloft on balloons, rockets or dropsondes. They can also be carried on the outer hulls of ships and aircraft or even mounted on towers. In this case, all that is needed to capture the measurements are storage devices and/or transponders.
Read more about this topic: Atmospheric Sounding
Famous quotes containing the words direct and/or methods:
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—Ralph Waldo Emerson (1803–1882)