This instrument is now retired but historical data can be found at the NSIDC website

Hydrological Sciences currently supports a ground-based microwave instrument system called ComRAD for Combined Radar/Radiometer which is mounted on a 19-m hydraulic boom truck.

NASA's Land, Vegetation, and Ice Sensor or "LVIS", is an airborne, wide-swath imaging laser altimeter system that is flown over target areas to collect data on surface topography and 3-d structure.

The Scanning L-band Active Passive (SLAP) is a new airborne simulator for NASA’s SMAP soil moisture satellite that launched in early 2015. 

The Snow Water Equivalent Synthetic Aperture Radar and Radiometer (SWESARR) is a new instrument designed to measure the water content in a snowpack. The instrument, developed at NASA’s Goddard Space Flight Center, uses active and passive microwave sensors to map the radio frequency emissions of the snowpack, which can then be turned into a measurement of snow water equivalent.