Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991

About InSAR

Differential interferometric synthetic aperture radar (InSAR) is used to measure displacements on Earth’s surface to a precision of a few centimeters or less. InSAR data are largely used to study deformation caused by earthquakes, volcanic eruptions, glacier movements, landslides, and subsidence.  They may also be used to examine the distribution of water vapor in the atmosphere, among other applications. For examples of InSAR applications, click on slide show at right.

Sentinel-1 InSAR BETA Products

Find Sentinel-1 InSAR Data(Use Vertex Mission tab)

GRFN (Getting Ready for NISAR) BETA products are prototype Level 2 interferometric products created by the Science Data System under development for the NISAR mission. The creation, discovery, and distribution of these products is to inform the NISAR mission team of possible cloud-based processing and data-management solutions. As such, these prototype products are not part of the ASF long-term archive, and may become unavailable at any time as new SAR interferometric processing and delivery methods are explored.

Collections
GRFN BETA products are divided into three Sentinel-1 collections:

  1. All Interferometric products
  2. Full-resolution wrapped interferogram and DEM
  3. Unwrapped interferogram and coherence map

Sites
These collections are over defined areas of interest which are currently (Unimak Island, Alaska; Kilauea Volcano, Hawaii; San Andreas Fault, California; Cedar City, Utah; and Carlsbad, New Mexico) and are updated daily. 

Processor
Products were processed using Jet Propulsion Laboratory's (JPL's) Science Data System under development for the NISAR mission, using the ISCE software package.


Legacy InSAR Services

Vertex Search and Order

ASF offers users the ability to search for a small set of legacy beta InSAR products via the Vertex interface (see coverage map). Through Vertex, users may search for SAR granules, view inSAR stacks, select InSAR pairs, and interact with the Baseline Plot tool.

Seamless SAR Access (SSARA) API

The SSARA API provides users with a single access point to search for InSAR pairs, corresponding 90-m SRTM Digital Elevation Model (DEM) data, and water-vapor models from the Online Services for Correcting Atmosphere in Radar (OSCAR) of NASA's Jet Propulsion Laboratory (JPL). ASF collaborated with UNAVCO, Open Topography, and JPL to create and deliver the SSARA API.
 

InSAR Uses

ALOS PALSAR Reveals Volcanoes Sink After Large Earthquakes by Matt Pritchard, Summer 2013.

ALOS PALSAR Interferometric Synthetic Aperture Radar (InSAR)  by Zhong Lu, Winter 2007.

Interferometric Synthetic Aperture Radar: Building Tomorrow’s Tools Today by Zhong Lu, Anniversary Edition, 2006.

Using InSAR to Study Earthquakes in South America  by Matt Pritchard, Winter 2004.

Sentinel-1 Interferometry from the Cloud to the Scientist by Jessica Garron,  AGU 2017

This Sentinel-1 interferogram was produced as part of the Getting Ready for NISAR project, a collaboration between ASF and JPL. This collection of beta products is available for download and review through Vertex and Earthdata Search. Contains modified Copernicus Sentinel data 2017, processed by ESA.This Sentinel-1 interferogram was produced as part of the Getting Ready for NISAR project, a collaboration between ASF and JPL. This collection of beta products is available for download and review through Vertex and Earthdata Search. Contains modified Copernicus Sentinel data 2017, processed by ESA.
Deformation resulting from 2008 Nevada earthquake. Image courtesy of Charles Wicks, USGS, © CSA.Deformation resulting from 2008 Nevada earthquake. Image courtesy of Charles Wicks, USGS, © CSA.
Water-level changes over swamp forest in southeastern Louisiana are revealed in this interferogram, created using ALOS PALSAR data acquisitions of January 29 and March 16, 2007. Each interferogram fringe (a full cycle of colors) represents a water-level change of about 13 cm. The interferogram suggests that water-level changes are dynamic, spatially heterogeneous, and disconnected by structures and barriers. Credit: Zhong Lu, USGS, Includes Material © JAXA, METI 2007 Water-level changes over swamp forest in southeastern Louisiana are revealed in this interferogram, created using ALOS PALSAR data acquisitions of January 29 and March 16, 2007. Each interferogram fringe (a full cycle of colors) represents a water-level change of about 13 cm. The interferogram suggests that water-level changes are dynamic, spatially heterogeneous, and disconnected by structures and barriers. Credit: Zhong Lu, USGS, Includes Material © JAXA, METI 2007
Motion of the Kennicott Glacier in Wrangell-St. Elias National Park, Alaska, is revealed by this ALOS PALSAR interferogram. Motion of glaciers between repeat passes of a satellite causes decorrelation of the phase signal returned from the glacier ice. This decorrelation, or loss of coherence, can be used by scientists to map the terminus of the glacier and study how it changes through time. Image credit: Franz Meyer, UAF. Includes Material © JAXA, METI 2007Motion of the Kennicott Glacier in Wrangell-St. Elias National Park, Alaska, is revealed by this ALOS PALSAR interferogram. Motion of glaciers between repeat passes of a satellite causes decorrelation of the phase signal returned from the glacier ice. This decorrelation, or loss of coherence, can be used by scientists to map the terminus of the glacier and study how it changes through time. Image credit: Franz Meyer, UAF. Includes Material © JAXA, METI 2007
This ALOS PALSAR interferogram was used to generate a digital elevation model of Death Valley, California. The fringes (full cycle of colors) in the image are changes in interferometric phase and correspond to variations in surface topography. The long spatial baseline of this interferogram causes strong sensitivity to topography changes and yields a dense fringe pattern in steep areas. Interferogram courtesy of Franz Meyer, UAF. Includes Material © JAXA, METI 2007 This ALOS PALSAR interferogram was used to generate a digital elevation model of Death Valley, California. The fringes (full cycle of colors) in the image are changes in interferometric phase and correspond to variations in surface topography. The long spatial baseline of this interferogram causes strong sensitivity to topography changes and yields a dense fringe pattern in steep areas. Interferogram courtesy of Franz Meyer, UAF. Includes Material © JAXA, METI 2007
Uplift and subsidence associated with a June 2007 earthquake swarm on Kilauea Volcano are depicted in this ALOS PALSAR interferogram. Kilauea Volcano, located on the southeast portion of the island of Hawai'i, has been erupting continuously since 1983. Interferogram courtesy of Zhong Lu, USGS, Includes Material © JAXA, METI 2007 Uplift and subsidence associated with a June 2007 earthquake swarm on Kilauea Volcano are depicted in this ALOS PALSAR interferogram. Kilauea Volcano, located on the southeast portion of the island of Hawai'i, has been erupting continuously since 1983. Interferogram courtesy of Zhong Lu, USGS, Includes Material © JAXA, METI 2007
Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.