NISAR’s First Data Release and a Surprising Antarctic Image

As of July 20, 2026, any researcher or member of the public can access the first continuous stream of calibrated radar data from NISAR, the flagship Earth-observing satellite jointly built and operated by NASA and the Indian Space Research Organisation (ISRO). The release marks roughly one year since the satellite launched from India’s Satish Dhawan Space Centre and follows months of instrument calibration and algorithm refinement.

Among the early visuals is a detailed radar image of East Antarctica’s Nunatak Zaterjavshijsja — a mountaintop protruding through a fast-moving ice stream. The processed data paints crevasses in vivid green, while smooth ice appears magenta, creating a pattern that mission scientists at NASA’s Jet Propulsion Laboratory quickly noted bears an uncanny resemblance to a hovering hummingbird.

NISAR carries two complementary synthetic-aperture radar systems: an L-band instrument provided by NASA and an S-band system from ISRO. By transmitting microwave signals and analyzing the polarization of the returning echoes, the satellite can see through snow and into the top layers of ice, distinguishing between clean surfaces and deeply fractured zones that are invisible in ordinary optical imagery. The mission scans nearly all of Earth’s land and ice masses twice every 12 days, generating dozens of terabytes of data daily.

The public release covers all L-band measurements collected since June 17, 2026, and will be supplemented continuously. By year’s end, the science team expects to have made available all data gathered since operations began. The archive will help scientists track glacier flow, forest cover, wetland changes, and natural hazards such as landslides and earthquakes.

Why Radar Vision Changes What We Know About Ice

Seeing Through the Ice with L-band Radar

The hummingbird image is more than an aesthetic curiosity. It demonstrates NISAR’s ability to detect volume scattering — radar signals that penetrate snow and ice, refract, and return with altered polarization. That capability allows glaciologists to map crevasses, internal ice layers, and the boundary between ice and bedrock, all critical for understanding how fast ice sheets are moving and how they may respond to warming. Conventional optical satellites, by contrast, show only a white, shadowed surface with little structural detail.

From Serendipity to Scientific Value

While the hummingbird shape was an accidental visual, the underlying data have immediate scientific uses. The deep fractures surrounding the nunatak reveal how glacial ice deforms as it flows past an obstacle. Tracking such features over time will help quantify ice velocity and mass loss in East Antarctica, a region that remains less studied than West Antarctica but holds enough ice to raise global sea levels by tens of meters over centuries.

A Growing Archive of Earth’s Changing Surfaces

NISAR’s dual-frequency design makes it unique among free-flying radar missions. The longer L-band waves can penetrate tree canopies to map ground deformation and flooding beneath forests, while the S-band captures details of the canopy itself. Combined with a revisit cadence of 12 days, the satellite will build an unprecedented time series of land and ice changes globally. The data are openly available, which lowers the barrier for universities, disaster agencies, and climate modellers worldwide to incorporate high-quality radar observations into their work.