  The measurement data from the boundary layer measurement masts in
Hamburg-Billwerder (Germany) and Hyytiala (Finland) make thermals visible. For
this, the temperature and humidity data must first be transformed to be
independent of altitude. The subsequent visualisation of this data shows an
impressive cross-section of the lower atmosphere with individual updrafts, but
also with air bubbles detaching from the ground or falling from higher
altitudes.
