One of the instruments operating on the roof of the AOSS building on the
UW-Madison campus is a
ceilometer, which
is used to measure the height of any cloud base directly above the
instrument.
More information:Model / manufacturer:Vaisala CT25K CeilometerApproximate Location: the rooftop of
the AO&SS building on the UW-Madison campus in Madison, WI (43.071,
-89.407), roughly 62m above the surface