G004-0035
The LiCSAR automated InSAR data processing system: Latest Developments and Future Prospects

Wednesday, 9 December 2020
Poster
Milan Lazecky1, Yasser Maghsoudi2, Scott Watson3, Yu Morishita4, Fabien Albino5, Daniel Juncu6, Chris Rollins7, John R Elliott2, Andrew J Hooper2 and Tim J Wright1, (1)University of Leeds, COMET, School of Earth and Environment, Leeds, LS2, United Kingdom, (2)University of Leeds, COMET, School of Earth and Environment, Leeds, United Kingdom, (3)University of Leeds, Leeds, United Kingdom, (4)Geography and Crustal Dynamics Research Center, Geospatial Information Authority of Japan, Tsukuba, Japan, (5)University of Bristol, COMET, School of Earth Sciences, Bristol, United Kingdom, (6)University of Leeds, COMET, Leeds, United Kingdom, (7)University of Leeds, Leeds, LS2, United Kingdom
Abstract:
Looking Into the Continents from Space with Synthetic Aperture Radar (LiCSAR) is a system built for large-scale interferometric processing of Sentinel-1 data. LiCSAR automatically produces geocoded wrapped and unwrapped interferograms combining every acquisition epoch with four preceding epochs, and complementary data (coherence, amplitude, line-of-sight unit vectors, digital elevation model, metadata, and atmospheric phase screen estimates by the Generic Atmospheric Correction Online Service, GACOS).

The LiCSAR products are generated in frame units where a standard frame covers ~220x250 km, at 0.001° resolution (WGS-84 coordinate system). Frames are continuously updated for tectonic and volcanic priority areas. As of July 2020, the LiCSAR system covers about 1,500 global frames in which we have processed over 89,000 Sentinel-1 acquisitions and generated over 300,000 interferograms. Among these, 470 frames cover 1,024 global volcanoes. We aim to cover the global seismic mask defined by the Committee on Earth Observation Satellites (CEOS), but focus initially on the Alpine-Himalayan belt and East African Rift. We serve the products as open and freely accessible through our web portal: https://comet.nerc.ac.uk/comet-lics-portal and aim to provide them to external organisations including the European Plate Observing System (EPOS). We also generate rapid response coseismic interferograms for earthquakes with moment magnitude (Mw)> 5.5 a few hours after the postseismic data become available, and we update frames covering active volcanoes twice per day.

We use GAMMA software as the processing core in our own LiCSAR codebase (based on python and bash scripts, empowered by MySQL database and various open-source or own tools). Our products can be directly converted to displacement time series and velocities using the LiCSBAS time series analysis software. We present the algorithms, processing, and storage solutions implemented in LiCSAR, and show several case studies that use LiCSAR and LiCSBAS products to measure tectonic and volcanic deformation, including regional velocity and strain rate fields, earthquake deformation maps, and examples of how LiCSAR products can be used in volcano monitoring.

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