Alaska Satellite Facility - Distributed Active Archive Center

NISAR Hub

The NASA-ISRO SAR mission (NISAR) is managed and developed by NASA’s Jet Propulsion Laboratory, in partnership with the Indian Space Research Organisation (ISRO).

The mission will measure Earth’s changing ecosystems, dynamic surfaces, and ice masses, providing information about biomass, natural hazards, sea level rise, and groundwater, and will support a host of other applications.

NISAR will observe Earth’s land and ice-covered surfaces globally with 12-day regularity on ascending and descending passes, sampling Earth on average every 6 days for a baseline 3-year mission.

Learn more about NISAR: https://nisar.jpl.nasa.gov/

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Indian Space Research Organisation logo

Overview

The NASA-ISRO Synthetic Aperture Radar (NISAR) project is a collaborative effort between the National Aeronautics and Space Administration (NASA) and the Indian Space Research Organisation (ISRO). NISAR represents a groundbreaking venture in Earth observation, leveraging advanced radar technology to provide unprecedented insights into the dynamics of the planet’s surface.

At its core, NISAR is designed to deliver high-resolution, all-weather, day-and-night imaging capabilities, making it a powerful tool for monitoring and studying various Earth processes. The mission aims to enhance our understanding of critical phenomena such as earthquakes, volcanoes, subsidence, and other geophysical events. By employing dual-frequency synthetic aperture radar, NISAR will generate precise measurements of surface deformations, facilitating comprehensive studies of Earth’s changing landscapes.

The project’s significance lies not only in its technological prowess but also in its global impact. NISAR is expected to contribute significantly to climate research, ecosystem monitoring, and disaster management. The collaboration between NASA and ISRO underscores the international scientific community’s commitment to advancing our knowledge of Earth and addressing global challenges collaboratively.

As NISAR progresses towards its anticipated launch, the project stands as a testament to the cooperative spirit of space exploration, bringing together the expertise of two leading space agencies. Through its cutting-edge technology and interdisciplinary applications, NISAR promises to be a valuable asset for scientists, researchers, and policymakers alike, fostering a deeper understanding of our planet’s dynamic processes.

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User Guide

The NISAR satellite has two fully capable synthetic aperture radar instruments (24 cm wavelength L-SAR and 10 cm wavelength S-SAR).

Coverage maps

This page will show global data coverage as the data become available.

Instrument

NISAR Instrumentation

Planned Launch Date2024
Orbit Altitude747 km
Orbit Inclination98.4º
Repeat Cycle12 days
Time of Nodal Crossing6 AM / 6 PM
Orbit Control< 500m
Pointing Control< 273 arcsec
PointingLeft (south)
L/S Duty> 50% / 10%
Baseline Mission Duration3 years
Consumables5 years
Data and Product AccessFree and open
WavelengthL-band: 24 cm
WavelengthS-band: 9 cm
SAR Resolution3-10 m mode-dependent
SAR Modes

The L-band SAR is capable of 242-kilometer swaths with 7-meter resolution along-track (the direction of travel) and 2- to 8-m resolution cross-track, depending on the viewing mode. This radar comprises 24 L-band transmit/receive array elements in 2 rows, 12 per polarization.

The 12cm wavelength S-band SAR supplied by ISRO is the secondary radar and comprises 48 S-band transmit/receive array elements in 2 rows, 24 per polarization.

NASA provides a high-capacity solid-state recorder (approximately 9 Tbits at end of life), GPS, 3.5 Gbps Ka-band telecom system, and an engineering payload to coordinate an imaging swath greater than 150 miles (240 km). This design permits complete global coverage every 12-days,

Image Quality
Documents, Tools, and Tutorials

NISAR Products

NISAR Level 0

Naming convention for NISAR L0ANaming convention for NISAR L0A products

Naming convention for NISAR L0B

Naming convention for NISAR L0B products

ProductLevelDescription
Radar Raw Science Telemetry (L0A) (RRST)L0AThis L0A product is the raw downlinked data delivered to SDS. Communication wrapping has been removed
Radar Raw Signal Data (L0B) (RRSD)L0BThis L0B product is corrected, aligned radar pulse data derived from the RRST products and used for further processing.

 

NISAR Level 1

 

ProductLevelDescription
Range Doppler Single Look Complex (RSLC)L1Focused SAR Imagery in range-Doppler coordinates.
Range Doppler Interferogram (RIFG)L1Multi-looked flattened (ellipsoid) interferogram in range-Doppler coordinates with no removal of topographic fringes. Formed using high-res offsets.
Range Doppler Unwrapped Interferogram (RUNW)L1Multi-looked unwrapped differential interferogram in range-Doppler coordinates with topo fringes removed.
Range Doppler pixel Offsets (ROFF)L1Raw pixel offsets layers in range and azimuth directions derived by speckle tracking with different resolutions (e.g., different chip and search window size) in range-Doppler coordinates.

 

NISAR Level 1, 2 & 3 products

 

Naming convention for the following NISAR Level 1, 2 & 3 products: RSLC, GSLC, GCOV, SME2

 

Naming convention for NISAR products RSLC, GSLC, GCOV & SME2

Naming convention for the following NISAR Level 1 & 2 products: RIFG, RUNW, GUNW, ROFF, GOFF

Naming convention for the following NISAR Level 2 products: RIFG, RUNW, GUNW, ROFF, GOFF

 

ProductLevelDescription
Geocoded Single Look Complex (GSLC)L2Geocoded SLC product using the MOE state vectors and a DEM.
Geocoded Unwrapped Interferogram (GUNW)L2Geocoded, multi-looked unwrapped differential Interferogram.
Geocoded Polarimetric Covariance (GCOV)L2Geocoded, multi-looked polarimetric covariance matrix.
Geocoded pixel Offsets (GOFF)L2Raw pixel offsets in range and azimuth directions derived by speckle tracking with different resolutions (e.g., different chip and search window size) in geocoded coordinates.

NISAR Level 3

 

See the above naming convention for the following NISAR Level 1, 2 & 3 products: RSLC, GSLC, GCOV, SME2

 

ProductLevelDescription
Soil Moisture (SME2)L3TBD

NISAR Citation Information

How to cite NISAR data: This information will be available soon.

Discover NISAR products

The NISAR products can be accessed at ASF DAAC:

Data Discovery Tools

Data Discovery ToolLink
ASF Vertex Data SearchVertex
Python Search Moduleasf_search
ASF Search APIASF Search API
NASA Earthdata SearchEarthdata Search

Learn more about ASF Data Discovery Services