8a975b9e-f18c-4c51-9bdb-b00b82da52b8 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 2017-06-16 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 Synthetic-aperture radar (SAR) processed airborne radio-echo sounding data from the Institute and Moller ice streams, West Antarctica, 2010-11 2017-06-16 creation 2017-06-16 revision 2017-06-16 publication 2017-06-16 released 1 https://doi.org/10.5285/8a975b9e-f18c-4c51-9bdb-b00b82da52b8 doi GB/NERC/BAS/PDC/00937 https://data.bas.ac.uk/ NE/G013071/1 award Please cite this item as: None SAR-processed two-dimensional radargram data in SEG-Y format acquired from the Institute and Moller ice streams, West Antarctica between mid-December 2010 and mid-January 2011. Data were collected using the British Antarctic Survey (BAS) Polarimetric radar Airborne Science Instrument (PASIN) radar, operated at a centre frequency of 150 MHz, and installed on the BAS Twin Otter aircraft "Bravo Lima". In total, ~25,000km of aerogeophysical data were collected, with coverage extending from the ice stream grounding zone to the ice divide. A high-resolution grid, with a line-spacing of 7.5 x 25 km, was acquired over the central parts of the ice stream catchments. Data were acquired during twenty-eight survey flights (sixteen flown from remote field camp C110, ten from Patriot Hills and two "transit" flights). Funding for this data acquisition was provided by the UK NERC AFI grant NE/G013071/1. These data should be cited as follows: Siegert, Martin et al. (2017); Synthetic-aperture radar (SAR) processed airborne radio-echo sounding data from the Institute and Moller ice streams, West Antarctica, 2010-11; Polar Data Centre, Natural Environment Research Council, UK; doi:10.5285/8a975b9e-f18c-4c51-9bdb-b00b82da52b8 No credit. completed Siergert, Martin Imperial College London; South Kensington Campus, London SW7 2AZ Researcher author Corr, Hugh British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK. Researcher author Ross, Neil Newcastle University; NE1 7RU, United Kingdom. Researcher author Jordan, Tom British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK. Researcher author Robinson, Carl British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK. Researcher author Jeofry, Hafeez Imperial College London; South Kensington Campus, London SW7 2AZ Researcher author Ferraccioli, Fausto British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK. Researcher author Bingham, Robert University of Edinburgh; Edinburgh EH8 9YL, UK. Researcher author Le Brocq, Anne University of Exeter; Exeter, EX4 4RJ, UK. Researcher author Rippin, David University of York; York, YO10 5NG, UK. 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 > Glacier Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography 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 Ice thickness Institute Ice Stream Moller Ice Stream PASIN Radargram Radio-echo sounding (RES) West Antarctica theme Institute and Moller ice streams, West Antarctica 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 governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions No restrictions apply. url url crossReference url url crossReference doi doi crossReference doi doi crossReference doi doi crossReference textTable eng utf8 environment geoscientificInformation -109.0 -59.0 -84.0 -78.0 2010-12-23 2011-01-12 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 13958643712 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=8a975b9e-f18c-4c51-9bdb-b00b82da52b8 WWW:LINK-1.0-http--link Get Data Download data download bytes 13958643712 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=8a975b9e-f18c-4c51-9bdb-b00b82da52b8 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Radio-echo sounding (RES) data were acquired over the Institute and Moller ice streams in the Weddell Sea sector of West Antarctica during the Institute-Moller Antarctic Funding Initiative (IMAFI) project from 23rd December 2010 to 9th January 2011. RES data were acquired with the British Antarctic Survey (BAS) Polarimetric radar Airborne Science Instrument (PASIN) radar, using the BAS Twin Otter aircraft "Bravo Lima" as the aerogeophysical platform. The PASIN antenna array is an eight-element folded dipole array attached below the starboard and port wings for reception and transmission. In addition to RES data, the project acquired aerogravity, aeromagnetic, LiDAR, GPS and radar altimeter data. A high-resolution survey grid, with primary line-spacing of 7.5 km, and tielines at 25 km spacing, was acquired over the central part of the ice stream catchments. Additional exploratory aerogeophysical flight lines were acquired to connect the IMAFI survey to existing surveys in adjacent ice streams catchments (e.g. Pine Island Glacier). The survey was flown in a stepped pattern, to achieve level flight that was required for simultaneous acquisition of airborne gravity data. Most data were acquired with a ground clearance <500 m. The BAS PASIN radar operates at a centre frequency of 150 MHz (Corr et al., 2007). The system transmits interleaved pulse and CHIRP waveforms, the former designed to resolve near-surface internal layering, and the latter for imaging of bed topography in areas of thick ice. The data described here were processed from the CHIRP dataset alone. The CHIRP has a bandwidth of 10 MHz, 4 kW of transmit power, an effective pulse repetition frequency of 312.5 Hz and a receiver sampling frequency of 22 Hz. Further detailed information describing the PASIN system can be found in Corr et al., (2007). Positioning of the aircraft was by differential GPS instruments on the aircraft, processed relative to a GPS base station at the field camp. Data processing and analysis of the IMAFI RES data is described in detail in Ross et al., (2012) and Jeofry et al., (2018). Raw RES data were processed using Doppler processing (Hélière et al., 2007) to migrate radar-scattering hyperbola in the along-track direction, and then sampled at 13 Hz to produce along-track measurements ('traces') at ~10 m spacing. SEG-Y files of these data were produced, and imported into ProMAX, where semi-automatic picking of the ice-bed interface was undertaken by a single operator. The range from the aircraft to the ice surface was determined using the aircraft radar altimeter, or where the radar altimeter data was of poor quality, nadir LiDAR measurements. Ice thickness (in metres) was determined by multiplying the two-way travel-time between the picked ice surface and ice sheet bed by 0.168 m ns-1, and applying an approximately 10 m correction for the firn layer (Ross et al., 2012). Values of ice surface and bed elevation were then calculated relative to the WGS84 ellipsoid. The spatial reference system was WGS84 EPSG4326. Note: the SEGY files available here are not georeferenced/contain error in the XY coordinates found in the binary headers. The georeferenced SEGY files for the SAR and non-SAR data can be found at: https://doi.org/10.5285/f32b298b-7906-4360-9e34-16739af73bb7 Data collection: The BAS Polarimetric radar Airborne Science Instrument (PASIN) radar operates at a centre frequency of 150 MHz, 10 MHz bandwidth and a data acquisition rate of 13 Hz giving a spatial sampling interval of ~10m. The PASIN system interleaves a pulse for imaging layering in the upper half of the ice column and CHIRP signal for imaging the deep ice column and bed topography. The system was installed on the BAS de Havilland Twin Otter aircraft with four-element folded dipole array attached below the starboard and port wings for reception and transmission, respectively. Data quality: Crossover analysis shows the RMS error of <18.3 m across the dataset (Ross et al., 2012; Jeofry et al., submitted). Note: the SEGY files available here are not georeferenced/contain error in the XY coordinates found in the binary headers. The georeferenced SEGY files for the SAR and non-SAR data can be found at: https://doi.org/10.5285/f32b298b-7906-4360-9e34-16739af73bb7 asNeeded completed