5f68fce1-863e-4173-acdb-0ed03cca1c95 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 2020-11-30 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 Radar-derived bed reflectivity of Rutford Ice Stream, West Antarctica, December 2016 to January 2017 2020-11-30 creation 2020-11-30 revision 2020-11-30 publication 2020-11-30 released 1.0 https://doi.org/10.5285/5f68fce1-863e-4173-acdb-0ed03cca1c95 doi GB/NERC/BAS/PDC/01438 https://data.bas.ac.uk/ NE/G014159/1 award NE/G013187/1 award Please cite this item as: Schlegel, R., Brisbourne, A., King, E., Murray, T., & Smith, A. (2020). Radar-derived bed reflectivity of Rutford Ice Stream, West Antarctica, December 2016 to January 2017 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5f68fce1-863e-4173-acdb-0ed03cca1c95 The dataset presented here contains a csv-file including the coordinates, received power of the bed reflection and the two-way travel time of the bed reflection. The X and Y coordinates are projected in EPSG:3031 - WGS 84 / Antarctic Polar Stereographic coordinate system. Data presented here have been frequency filtered and 2D migrated (using a finite difference approach and migration velocity of 0.168 m ns-1), followed by the picking of the bed reflection using ReflexW software (Sandmeier Scientific Software). The received power is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000). This work was funded within the BEAMISH project by NERC AFI award numbers NE/G014159/1 and NE/G013187/1. No credit. completed Schlegel, Rebecca Swansea University Researcher author Brisbourne, Alex British Antarctic Survey Researcher author King, Edward British Antarctic Survey Researcher author Murray, Tavi Swansea University Researcher author Smith, Andrew British Antarctic Survey 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 Topography/Ice Sheet Topography EARTH SCIENCE > Spectral/Engineering > Radar > Radar Reflectivity 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 BEAMISH West Antarctica fast flowing ice stream radar reflectivity theme Rutford Ice Stream Antarctica place Elevation 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 This data is supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url largerWorkCitation url url crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference textTable eng utf8 geoscientificInformation -84.5247 -83.5254 -78.2038 -78.0139 2016-12-01 2017-01-31 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 text/plain text/csv bytes 14784922 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5f68fce1-863e-4173-acdb-0ed03cca1c95 WWW:LINK-1.0-http--link Get Data Download data download bytes 14784922 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5f68fce1-863e-4173-acdb-0ed03cca1c95 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Data presented here have been frequency filtered and 2D migrated (using a finite difference approach and migration velocity of 0.168 m ns-1), followed by the picking of the bed reflection using ReflexW software (Sandmeier Scientific Software). Reflectivity values were calculated following the method by Gades et al., (2000). The received power, presented in this dataset, is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000). This received power has not been corrected for englacial attenuation. A calibration of the amplitude of this dataset using a control reflection point (e.g. where the dielectric contrast is known, such as at the ice-water interface at the base of an ice shelf) has not been possible here. The reflectivity within this data therefore only represents relative reflectivity. Detailed information on how the reflectivity can be calibrated and analysed will be contained in Schlegel et al. (in prep.). Data collection: Instrumentation: Surface radar data were acquired in 2016/17 (as part of the BEAMISH project), using the British Antarctic Survey (BAS) DELORES radar system (King et al., 2007). This system has a half-dipole length of 20 m, and radiates energy with a centre-frequency of ~3 MHz. Navigation along each line was provided by single-frequency GPS units mounted on the towing snowmobile. A sledge at the midpoint between receiver and transmitter was equipped with dual-frequency GPS receivers to provide more accurate positions for post-processing. Software: ReflexW (Sandmeier Scientific Software) as well as MATLAB for the calculation of the received power. Data quality: The centre frequency of the DELORES dataset presented here is 3 MHz, the wavelength in ice (wave speed in ice=0.168 m ns-1) is 56 m. Lines were acquired perpendicular to the ice flow, with a 500 m spacing between them. The along track sampling is around 2 m. Data has been 2D migrated (along acquisition direction), the theoretical horizontal resolution of the dataset after 2D migration is 12 m. The bed reflection was clearly identifiable along the whole dataset. The received power is calculated within a 280 ns time window centred on, and encompassing, the bed reflection (Gades et al., 2000). asNeeded completed