Historic NASA-ISRO NISAR Satellite Launch Marks New Era in Earth Observation

Sriharikota, India – July 30, 2025 – In a landmark achievement for global space collaboration, the Indian Space Research Organisation (ISRO) and the National Aeronautics and Space Administration (NASA) successfully launched the NASA-ISRO Synthetic Aperture Radar (NISAR) satellite from the Satish Dhawan Space Centre in Sriharikota, Andhra Pradesh, at 5:40 p.m. IST. This historic mission, valued at over $1.5 billion, represents the first joint satellite project between the two agencies, combining their technological expertise to revolutionize Earth observation with unprecedented detail and capability. The launch, carried out aboard ISRO’s Geosynchronous Satellite Launch Vehicle (GSLV-F16), marks a significant milestone in U.S.-India civil space cooperation, as highlighted by President Trump and Prime Minister Modi during their February 2025 meeting in Washington.

A Decade-Long Collaboration

The NISAR mission, a decade in the making, underscores the growing partnership between NASA and ISRO, building on previous successes like the Chandrayaan-1 lunar mission and the recent Axiom Mission 4, which saw astronauts from both agencies working together aboard the International Space Station. The satellite, weighing 2,392 kilograms, was injected into a 743-kilometer Sun-synchronous polar orbit with an inclination of 98.4 degrees, a first for a GSLV rocket, which typically handles geostationary missions. This orbit allows NISAR to scan nearly all of Earth’s land and ice-covered surfaces every 12 days, providing consistent, high-resolution data regardless of weather or lighting conditions.

NISAR is equipped with dual-frequency Synthetic Aperture Radar (SAR) systems: an L-band radar (1.25 GHz, 24 cm wavelength) from NASA and an S-band radar (3.20 GHz, 12 cm wavelength) from ISRO. These radars, integrated with NASA’s 12-meter unfurlable mesh reflector antenna and ISRO’s modified I3K spacecraft bus, utilize the innovative SweepSAR technique to achieve a 242-kilometer swath with high spatial resolution. This combination makes NISAR the most advanced Earth-observing radar satellite ever launched by either agency, capable of detecting surface changes as small as fractions of an inch.

Unprecedented Capabilities for Earth Observation

NISAR’s dual-band radar system is designed to monitor a wide range of Earth’s dynamic processes, offering critical insights for scientists, policymakers, and disaster management authorities. The L-band radar, built by NASA’s Jet Propulsion Laboratory (JPL) in Southern California, penetrates deep into forest canopies and is ideal for detecting large-scale changes, such as glacier movements and tall vegetation. The S-band radar, developed by ISRO’s Space Applications Centre in Ahmedabad, excels at capturing smaller changes, including soil moisture and short vegetation. Together, these systems generate approximately 80 terabytes of data daily—enough to fill 150 512-gigabyte hard drives—making NISAR the most data-intensive Earth satellite mission to date.

The satellite’s ability to “see” through clouds and light rain, day or night, enables continuous monitoring of critical areas, including earthquake- and landslide-prone regions, volcanic zones, and infrastructure such as levees, aqueducts, and dams. “NISAR can detect even subtle changes in the Earth’s surface, such as ground deformation, ice sheet shifts, and vegetation dynamics,” ISRO shared in a statement on X. This capability is expected to enhance disaster preparedness and response, providing early warnings for natural hazards like earthquakes, tsunamis, volcanoes, and landslides.

Applications for a Changing Planet

NISAR’s data will support a broad range of applications, from climate change monitoring to agricultural management and infrastructure assessment. Key objectives include:

• Climate Change Monitoring: NISAR will track the movement and melting of ice sheets and glaciers in Greenland and Antarctica, providing critical data for understanding sea-level rise. It will also monitor changes in forests and wetlands, which play a vital role in global carbon cycles.
• Natural Hazard Assessment: The satellite’s high-resolution imagery will detect minute land surface deformations related to seismicity, volcanism, landslides, and subsidence or uplift associated with subsurface aquifers and hydrocarbon reservoirs. This information will help governments prepare for and mitigate the impacts of natural disasters.
• Agricultural and Ecosystem Management: By mapping crop growth, tracking plant health, and monitoring soil moisture, NISAR will provide timely data for decision-making in agriculture. Its L-band radar will offer insights into forest structure, while the S-band radar will monitor crop dynamics, aiding in sustainable resource management.
• Oceanic and Coastal Observations: NISAR will study sea ice dynamics, classify sea ice types, and monitor shorelines and storm impacts, contributing to improved maritime safety and coastal resilience.

A key feature of the mission is the democratization of data. All NISAR data will be freely accessible within one to two days of observation, and in near real-time during emergencies, supporting global scientific research and decision-making, particularly for developing nations. “This mission is not just about a satellite launch—it symbolizes what two democracies committed to science and global welfare can achieve together,” said Union Minister for Science and Technology Dr. Jitendra Singh.

A Technological Marvel

The NISAR satellite, roughly the size of a pickup truck, represents a triumph of engineering collaboration. NASA contributed the L-band SAR, a high-rate telecommunication subsystem, GPS receivers, a solid-state recorder, and the 12-meter deployable antenna. ISRO provided the S-band SAR, the spacecraft bus, the GSLV-F16 launch vehicle, and launch services. The satellite was fully integrated in January 2024 at ISRO’s Satellite Integration and Testing Establishment in Bengaluru, with final testing completed by May 2025. It was then transported 360 kilometers by truck to the Satish Dhawan Space Centre for launch preparations.

The use of SweepSAR technology, a first for a spaceborne mission, allows NISAR to achieve wide coverage without sacrificing resolution, a significant advancement over previous SAR missions like NASA’s Seasat (1978) and ISRO’s RISAT-1 (2012) and RISAT-1A (2022). The satellite’s three-year mission life, with a potential extension to five years, ensures a robust dataset for long-term studies of Earth’s changing surface.

A New Chapter in U.S.-India Space Cooperation

The NISAR launch marks a defining moment in Indo-U.S. space collaboration, reflecting India’s emergence as a credible global player in advanced Earth observation systems. “This is a historic moment for both ISRO and NASA, a classic example of collaborative effort between two great democratic countries,” said Nilesh M. Desai, Director of ISRO’s Space Applications Centre. The mission aligns with Prime Minister Modi’s vision of India as a “Vishwa Bandhu” (global partner), contributing to the collective good through accessible, high-quality data.

Following the launch, NISAR entered a 90-day In-Orbit Checkout (IOC) phase to calibrate its systems and prepare for full scientific operations. The data collected during this period will be processed, stored, and distributed via the cloud, ensuring global accessibility. NASA’s Goddard Space Flight Center will manage the Near Space Network for L-band data reception, while ISRO’s National Remote Sensing Centre will handle S-band data and operational product generation.

Global Impact and Future Prospects

With a total cost of approximately $1.5 billion—$1.118 billion from NASA and $93 million (₹788 crore) from ISRO—NISAR is likely the world’s most expensive Earth-imaging satellite. Its high-resolution, all-weather capabilities are expected to transform our understanding of Earth’s dynamic processes, from ecosystem disturbances to ice-sheet collapse and natural hazards. Space scientist R.C. Kapoor described NISAR as “the most advanced Earth observation satellite to date,” emphasizing its potential to generate critical insights for decision-makers worldwide.

As the world faces increasing challenges from climate change and natural disasters, missions like NISAR are vital for building resilience and informing policy. “Missions like NISAR are no longer confined to scientific curiosity—they are instrumental in planning, risk assessment, and policy intervention,” Dr. Jitendra Singh noted. The launch, livestreamed by ISRO and NASA, was watched by millions, underscoring global interest in this groundbreaking mission.

For more information, visit https://nisar.jpl.nasa.gov/.

References

• NASA, “5 Things to Know About Powerful New U.S.-India Satellite, NISAR,” July 2025, https://www.nasa.gov/missions/nisar/5-things-to-know-about-powerful-new-u-s-india-satellite-nisar/
• Mathrubhumi, “ISRO-NASA’s NISAR Earth Observation Satellite Successfully Launched from Sriharikota,” July 30, 2025, https://english.mathrubhumi.com/news/india/isro-nasas-nisar-earth-observation-satellite-successfully-launched-from-sriharikota-watch-pgin2710
• Republic World, “Exact Moment When NASA-ISRO NISAR Satellite, Most Advanced Earth Observation Radar, Launched From Sriharikota,” July 30, 2025, https://www.republicworld.com/science/exact-moment-when-nasa-isro-nisar-satellite-most-advanced-earth-observation-radar-launched-from-sriharikota-watch
• ISRO, X Post, July 28, 2025
• NASA, X Post, July 30, 2025