NISAR
The Earth is constantly changing—mountains shift, forests grow or shrink, glaciers melt, and coastlines reshape. But much of this change happens quietly and slowly, often going unnoticed. To understand these hidden transformations, scientists need sharp, reliable eyes in space.
Enter NISAR, the NASA–ISRO Synthetic Aperture Radar mission—one of the most ambitious Earth-monitoring satellites ever created.
Launched jointly by NASA (United States) and ISRO (India), NISAR is designed to study our planet in extraordinary detail. It will map almost the entire Earth every 12 days, capturing changes as small as a few millimeters!
What Exactly Is NISAR?
NISAR is an advanced Earth-observation satellite equipped with Synthetic Aperture Radar (SAR)—a special kind of radar that can take extremely detailed images of Earth’s surface.
Unlike normal cameras, radar can:
● See through clouds
● Work day and night
● Capture precise measurements in all weather conditions
This makes NISAR incredibly reliable, especially in regions that are cloudy, remote, or difficult to access.
🛰️ A Historic Partnership
NISAR is the first mission where NASA and ISRO have built major satellite components together.
NASA built the L–band radar, communication systems, and data processing equipment.
ISRO built the S–band radar, the spacecraft body, and launched the mission using the GSLV rocket.
This collaboration marks a milestone in global space cooperation.
How Does NISAR Help Us?
NISAR’s radar senses tiny movements and changes on Earth’s surface. This data will help scientists understand and respond to:
1. Natural Disasters
● Earthquakes
● Volcanoes
● Landslides
● Floods and cyclones
2. Climate Change
● Melting glaciers
● Changes in ice sheets
● Sea-level rise
● Forest carbon storage
3. Agriculture & Water
● Crop monitoring
● Soil moisture detection
● Surface and groundwater studies
4. Forests and Ecosystems
● Deforestation
● Wetland mapping
● Biodiversity monitoring
🚀 The Technology Behind NISAR
NISAR carries two powerful radar systems:
● L-band radar (NASA) – penetrates deeper into forests and soil
● S-band radar (ISRO) – ideal for monitoring crops, vegetation, and disasters
Together, they provide a complete, highly accurate picture of Earth’s changing surface.
A highlight of the mission is the 12-meter-wide radar antenna, one of the largest ever sent to space!
Do You Know?
● NISAR’s antenna is 12 meters wide—almost the size of a school bus.
● It can detect ground movement as small as 1–4 mm from 747 km above Earth.
● It will map the entire Earth in just 12 days.
● The mission will produce huge amounts of data every day, all freely available to the public.
● SAR can take clear pictures during storms, floods, and at night.
● NISAR is the world’s first mission to use both L-band and S-band radar together.
● It is a $1.5-billion collaboration, one of the costliest Earth-observation missions ever.
● It can help predict landslides and volcanic eruptions by tracking tiny surface movements.
● Scientists will be able to monitor glacier movement and melting every few days.
● The mission is a symbol of friendship and scientific partnership between India and the United States.
Why NISAR Matters
Earth is changing faster than ever. Climate change, urban growth, melting ice, droughts, and natural hazards affect millions of lives. NISAR provides early warnings, scientific insight, and a deeper understanding of our planet.
More importantly, it proves that international collaboration can lead to extraordinary achievements.
In Simple Words…
NISAR is a super-detailed, all-weather, day-night radar satellite that will help us monitor, understand, and protect our planet.
NISAR is now in the process of becoming fully operational — here’s the current status:
✅ What’s the Current Status of NISAR
1. First Radar Images Are Already Here
On Aug 21, 2025, NISAR’s L-band radar captured its first image of Mount Desert Island, Maine.
On Aug 23, 2025, it imaged wetlands and farmland in North Dakota, showing forests, circular irrigation fields, and more.
These images were taken during the commissioning phase, not full science operations yet.
2. Commissioning / Check-Out Phase
After launch on July 30, NISAR spent about 90 days in a commissioning phase.
During this time, engineers tested and calibrated both radars (L-band and S-band), and raised the satellite to its operational orbit.
The large 12-meter antenna reflector successfully deployed in orbit.
3. Science Operations Starting Soon
According to NASA, full science operations are expected to begin ~ 90 days after launch.
NASA and ISRO are targeting early November 2025 for the mission to be officially declared “operational.”
NISAR has already started collecting some data (test / commissioning images).
Not yet in full science mission mode — that should begin around November 2025, once commissioning is fully completed.