Preprints
https://doi.org/10.5194/essd-2021-393
https://doi.org/10.5194/essd-2021-393
 
14 Dec 2021
14 Dec 2021
Status: a revised version of this preprint is currently under review for the journal ESSD.

Processing methodology for the ITS_LIVE Sentinel-1 ice velocity product

Yang Lei1, Alex S. Gardner2, and Piyush Agram1 Yang Lei et al.
  • 1Division of Geological and Planetary Science, California Institute of Technology, Pasadena, 91125, USA
  • 2Jet Propulsion Laboratory, California Institute of Technology, 5 Pasadena, 91109, USA

Abstract. The NASA MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project seeks to accelerate understanding of critical glaciers and ice sheet processes by providing researchers with global, low-latency, comprehensive and state-of-the-art records of surface velocities and elevations as observed from space. Here we describe the image-pair ice velocity product and processing methodology for ESA Sentinel-1 radar data. We demonstrate improvements to the core processing algorithm for dense offset tracking, “autoRIFT”, that provides finer resolution and higher accuracy data products with improved computational efficiency when compared to earlier versions. A novel calibration is applied to the data to correct for Sentinel-1A/B subswath- and full swath-dependent geolocation errors caused by systematic issues with the instruments. Sentinel-1’s C-band images are affected by variations in the total electron content of the ionosphere that results in large velocity errors in the azimuth (along-track) direction. To reduce these effects slant-range (line-of-sight or LOS) velocities are used and accompanied by LOS parameters that support map coordinate (x/y) velocity inversion from ascending and descending slant-range offset measurements, as derived from 2 image-pairs. The described product and methods comprise the MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: Version 2 (https://its-live.jpl.nasa.gov).

Yang Lei et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2021-393', Anonymous Referee #1, 16 Mar 2022
  • RC2: 'Comment on essd-2021-393', Anonymous Referee #2, 21 Mar 2022
  • EC1: 'Comment on essd-2021-393', Kenneth Mankoff, 26 Mar 2022
  • AC1: 'Comment on essd-2021-393', Yang Lei, 08 Jun 2022

Yang Lei et al.

Data sets

MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: Version 2 (Greenland Sample Products) Yang Lei, Alex S. Gardner and Piyush Agram https://doi.org/10.5281/zenodo.5606118

Model code and software

autoRIFT (autonomous Repeat Image Feature Tracking) Alex S. Gardner, Yang Lei and Piyush Agram https://doi.org/10.5281/zenodo.5643820

Yang Lei et al.

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Short summary
This work is done in support of NASA's MEaSUREs Inter-mission Time Series of Land Ice Velocity and Elevation (ITS_LIVE) project. Here we detail the data product and methods that comprise the MEaSUREs ITS_LIVE Sentinel-1 Image-Pair Glacier and Ice Sheet Surface Velocities: Version 2 (https://its-live.jpl.nasa.gov). We also provide 21 sample dataset (https://doi.org/10.5281/zenodo.5606118) generated using the associated open-access software autoRIFT (https://github.com/nasa-jpl/autoRIFT).