Abstract
Abstract. The NASA Advancing Collaborative Connections for Earth System Science (ACCESS) seamless synthetic aperture radar (SAR) archive (SSARA) project is a collaboration between UNAVCO, the Alaska Satellite Facility (ASF), the Jet Propulsion Laboratory (JPL), and OpenTopography at the San Diego Supercomputer Center (SDSC) to design and implement a seamless distributed access system for SAR data and derived interferometric SAR (InSAR) data products. A unified application programming interface (API) has been created to search the SAR archives at ASF and UNAVCO, 30 and 90-m SRTM DEM data available through OpenTopography, and tropospheric data from the NASA OSCAR project at JPL. The federated query service provides users a single access point to search for SAR granules, InSAR pairs, and corresponding DEM and tropospheric data products from the four archives, as well as the ability to search and download pre-processed InSAR products from ASF and UNAVCO.
Highlights
Differential interferometric synthetic aperture radar (InSAR) is used to measure displacements on Earth’s surface to a precision of a few centimeters or less
UNAVCO and Western North America InSAR Consortium (WInSAR) worked with the European Space Agency (ESA) to promote and develop the Group of Earth Observation (GEO) Geohazard Supersites and Natural Laboratories (GSNL) data sharing concept and to prototype infrastructure for SAR data
OT has developed a cyberinfrastructure platform built on a service oriented architecture (SOA) to enable efficient online access to these datasets along with web based processing tools to generate derived products including digital elevation models (DEMs) (Krishnan et al, 2011)
Summary
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 be used to examine the distribution of water vapor in the atmosphere, among other applications. An interferogram is formed from two or more SAR granules acquired at different times that cover the same area of ground and have the same acquisition geometry. These granules are referred to as a master image and slave image(s). Enhance ASF SAR interferometric processing service to access distributed SSARA data collections, utilize terrain correction service, and generate enhanced QC products. Establish processed InSAR data products and QC product archives at ASF and UNAVCO
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