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.
GRFN BETA products are divided into three Sentinel-1 collections:
- All Interferometric products
- Full-resolution wrapped interferogram and DEM
- Unwrapped interferogram and coherence map
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.
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.
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