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