Airborne Glacier and Land Ice Surface Topography Interferometer.
JPL's Earth Science Airborne Program includes the G-III research aircraft with an all-weather, high-resolution instrument called the Glacier and Ice Surface Topography Interferometer (GLISTIN). This instrument was developed to study small changes in ice sheets, but is also used for applications such as studying the surface topography of the Kilauea Volcano's East Rift Zone. GLISTIN data can be used to detect changes in Kilauea's topography associated with the new lava flows, with the goal of measuring the erupted volume as a function of time and ultimately the total volume of the event. Such observations are extremely useful to quantitatively evaluate models for evolution of volcanic processes.