d55e87dd-a74d-4182-be99-93ab805103ab 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 2021-09-27 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 Processed bed elevation picks from the POLARGAP radar survey across the Pensacola-Pole Basin (2015/2016) 2021-09-27 creation 2021-09-27 revision 2021-09-27 publication 2021-09-27 released 1.0 https://doi.org/10.5285/d55e87dd-a74d-4182-be99-93ab805103ab doi GB/NERC/BAS/PDC/01568 https://data.bas.ac.uk/ Please cite this item as: Corr, H., Ferraccioli, F., Forsberg, R., Jordan, T., Kohler, J., Matsuoka, K., Olesen, A., & Robinson, C. (2021). Processed bed elevation picks from the POLARGAP radar survey across the Pensacola-Pole Basin (2015/2016) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/d55e87dd-a74d-4182-be99-93ab805103ab This dataset contains bed and surface elevation picks derived from airborne radar collected during the POLARGAP 2015/16 project funded by the European Space Agency (ESA) and with in-kind contribution from the British Antarctic Survey, the Technical University of Denmark (DTU), the Norwegian Polar Institute (NPI) and the US National Science Foundation (NSF). This collaborative project collected ~38,000 line-km of new aerogeophysical data using the 150MHz PASIN radar echo sounding system (Corr et al., 2007) deployed on a British Antarctic Survey (BAS) Twin Otter. The primary objective of the POLARGAP campaign was to carry out an airborne gravity survey covering the southern polar gap beyond the coverage of the GOCE orbit. This dataset covers the South Pole as well as parts of the Support Force, Foundation and Recovery Glaciers. The bed pick data acquired during the POLARGAP survey over the Recovery Lakes is archived at NPI: https://doi.org/10.21334/npolar.2019.ae99f750. No credit. completed Corr, Hugh British Antarctic Survey Researcher author Ferraccioli, Fausto British Antarctic Survey Researcher author Forsberg, Rene Technical University of Denmark Researcher author Jordan, Tom British Antarctic Survey Researcher author Kohler, Jack Norwegian Polar Institute Researcher author Matsuoka, Kenichi Norwegian Polar Institute Researcher author Olesen, Arne Technical University of Denmark Researcher author Robinson, Carl 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 Elevation/Ice Sheet Elevation EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Spectral/Engineering > Radar 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 Antarctic aerogeophysics ice thickness radar surface elevation theme Pensacola-Pole Basin, East 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 Further by downloading this data the user acknowledges that they agree with the NERC data policy (), and the following conditions: 1. To cite the data in any publication as follows: Corr, H., Ferraccioli, F., Forsberg, R., Jordan, T., Kohler, J., Matsuoka, K., Olesen, A., & Robinson, C. (2021). Processed bed elevation picks from the POLARGAP radar survey across the Pensacola-Pole Basin (2015/2016) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/D55E87DD-A74D-4182-BE99-93AB805103AB 2. The user recognizes the limitations of data. Use of the data is at the users' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data. otherRestrictions None doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference url url largerWorkCitation url url largerWorkCitation url url crossReference textTable eng utf8 elevation geoscientificInformation -172.34 167.26 -89.99 -80.72 2015-12-07 2016-01-19 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/csv bytes 168191590 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d55e87dd-a74d-4182-be99-93ab805103ab WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Radar data were collected using the 150-MHz PASIN radar echo sounding system operating in full polarimetric mode. Data provided here includes picks and derived elevations of the ice sheet surface and bed for the BAS-led part of this campaign, which includes the survey lines over the South Pole, as well as Support Force, Foundation and Recovery Glaciers. The radar data was processed using a coherent averaging filter (commonly referred to as unfocused Synthetic Aperture Radar (SAR) processing) with Doppler beam sharpening to enhance the signal to clutter ratio of the bed echo and improve visualisation. The received chirp of 4 microseconds, 12 MHz bandwidth data was compressed, filtered, and decimated from the original trace acquisition rate of 156.25 Hz to 2Hz, equivalent to ~30m in along-track spacing. The bed reflector was picked in a semi-automated manner within the seismic processing package ProMax. An automatic first break picker was applied initially, with subsequent manual editing/removal of picks which appear unreasonable. The picked travel time was then converted to depth using a radar wave speed of 168 m/microseconds and a constant firn correction of 10 m. Where possible, the ice surface location within the radargrams was calculated using lidar measurements of surface elevation. In areas where lidar data was not available (principally due to terrain clearance, cloud or where the lidar was not used), the location of the surface reflection was picked directly from the radargram and a regression, local to the data gap, was used to fit the radar range to terrain clearance. Bed elevation was integrated with a high precision kinematic dual-frequency GPS position solution to provide the final point data set of ice thickness and bed elevation relative to WGS84. Positions are calculated for the phase centre of the aircraft antenna. All positions (Longitude, Latitude and Height) are referred to the WGS1984 ellipsoid. Longitude and Latitude are provided in WGS84 (EPSG 4326). DATA FORMAT: The dataset includes an intermediate processing product (in .csv), with attributes as follows: Line_ID: Flight name e.g. P03.1 Trace: Radar segy file trace number Longitude_decimal_degrees: Longitude in decimal degrees (WGS84 EPSG:4326) Latitude_decimal_degrees: Latitude in decimal degrees (WGS84 EPSG:4326) DateTime_YYYY-MM-DD_HH:MM:SS.SSS: Date (YYYY/MM/DD) and Time UTC (HH:MM:SS.SSS) of trace separated by 'T' Surface_elevation_WGS84_m: Surface Elevation (m) relative to WGS84 Ellipsoid Ice_thickness_m: Ice thickness (m) calculated for a radar velocity in ice of 168 microseconds and applying a 10-m firn Bed_elevation_WGS84_m: Bedrock Elevation (m) relative to WGS84 Ellipsoid PriNumber: Radar counter in segy header (arbitrary units) Surface_pick: Location down trace of surface pick Bed_pick: Location down trace of bed elevation pick Aircraft_elevation_WGS84_m: Elevation (m) of aircraft IMU relative to WGS84 Ellipsoid Campaign_name: Name of the campaign Owner: Owner of the data Funding: Funding providers Note: missing data values where no surface/bed pick/elevation exist are reported as '-9999'. Data collection: Radar data were collected using the PASIN radar echo sounding system operating in full polarimetric mode with a centre frequency of 150 MHz and using a 4-microseconds, 12 MHz bandwidth linear chirp. Data quality: Crossover analysis of recovered bed elevation across the entire survey gives an error estimate for the PolarGAP survey of ~28 m. asNeeded completed