upper-air sounding
From Glossary of Meteorology
(Also called upper-air observation.) A measurement of the vertical profile of the thermodynamic and kinematic state of the atmosphere.
A radiosonde makes an in situ point measurement of the atmosphere that it passes through. In contrast, a radar or lidar profiler makes a remotely sensed volumetric measurement of the atmosphere above the profiler location.
See also radiosonde observation, rawinsonde, rocketsonde, sounding.