668bf042-d0de-4741-a62e-2ae93b6f7106 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2021-05-25 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Thwaites Glacier ice surface speed change from January 2012 to January 2021 2021-05-25 creation 2021-05-25 revision 2021-05-25 publication 2021-05-25 released 1.0 https://doi.org/10.5285/668bf042-d0de-4741-a62e-2ae93b6f7106 doi GB/NERC/BAS/PDC/01506 https://data.bas.ac.uk/ NE/P011365/1 award NE/S006605/1 award Please cite this item as: Bevan, S., Luckman, A., & Benn, D. (2021). Thwaites Glacier ice surface speed change from January 2012 to January 2021 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/668bf042-d0de-4741-a62e-2ae93b6f7106 A map of changes in ice surface speed in metres/year for Thwaites Glacier, West Antarctica, between January 2012 and January 2021. Speeds based on feature tracking of satellite synthetic aperture radar data. The work was funded by NERC projects NE/P011365/1 and NE/S006605/1. No credit. completed Bevan, Suzanne Swansea University Researcher author Luckman, Adrian Swansea University Researcher author Benn, Douglas University of St Andrews Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glaciers EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Motion/Ice Sheet Motion EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glaciers theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher ITGC Thwaites Glacier acceleration ice surface speed theme Thwaites Glacier Antarctica place Elevation Hydrography theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url crossReference doi doi crossReference doi doi crossReference textTable eng utf8 geoscientificInformation imageryBaseMapsEarthCover -109.0 -106.0 -77.0 -74.0 2012-01-01 2021-01-31 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor image/tiff bytes 9122611 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=668bf042-d0de-4741-a62e-2ae93b6f7106 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: January 2012 speeds were measures using feature-tracking of TerraSAR-X data between a pair of images acquired on 17/01/2012 and 28/01/2012. Speeds were measured at a horizontal resolution of 40 m. Image data were supplied by DLR. The 2021 speeds were measured using feature-tracking Sentinel-1A and Sentinel-1B images and are a mean of all ten 6- or 12-day pairs acquired in January 2021. Speeds were measured at a horizontal resolution of 100 m and oversampled to 40 m before differencing (2021-2012) with the 2012 speeds. Image data were supplied by ESA. Data collection: Feature-tracking was carried out using Gamma Remote Sensing software 20190603. Data quality: All feature-tracked displacements were filtered twice: first by a signal to noise ratio based on the cross-correlation of image patches, and then according to deviation from the mean displacement within a neighbourhood. The displacements were converted from the SAR image geometry to ground range geometry, and the results geocoded using the RAMP DEM (Liu et al., 2015). N/A values in the difference geotiff are where either the 2012 or 2021 data are missing. asNeeded completed