91523ff9-d621-46b3-87f7-ffb6efcd1847 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 2022-02-28 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 BEDMAP3 - Ice thickness, bed and surface elevation for Antarctica - standardised data points 2022-02-28 creation 2022-02-28 revision 2022-02-28 publication 2022-02-28 released 1.0 https://doi.org/10.5285/91523ff9-d621-46b3-87f7-ffb6efcd1847 doi GB/NERC/BAS/PDC/01614 https://data.bas.ac.uk/ Please cite this item as: Fremand, A., Fretwell, P., Bodart, J., Pritchard, H., Aitken, A., Bamber, J., Bell, R., Bianchi, C., Bingham, R., Blankenship, D., Casassa, G., Catania, G., Christianson, K., Conway, H., Corr, H., Cui, X., Damaske, D., Damn, V., Drews, R., ... Zirizzotti, A. (2022). BEDMAP3 - Ice thickness, bed and surface elevation for Antarctica - standardised data points (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/91523ff9-d621-46b3-87f7-ffb6efcd1847 We present here the Bedmap3 ice thickness, bed and surface elevation standardised CSV data points that are used to create the Bedmap3 gridding products in addition to the previous data releases. The data consists of 50 million points acquired by 17 different data providers in Antarctica. The associated Bedmap datasets are listed here: https://www.bas.ac.uk/project/bedmap/#data This work is supported by the SCAR Bedmap project and the British Antarctic Survey's core programme: National Capability - Polar Expertise Supporting UK Research No credit. completed Fremand, Alice British Antarctic Survey Researcher author Fretwell, Peter British Antarctic Survey Researcher author Bodart, Julien British Antarctic Survey Researcher author Pritchard, Hamish British Antarctic Survey Researcher author Aitken, A. Centre for Exploration Targeting, University of Western Australia Researcher author Bamber, Jonathan University of Bristol Researcher author Bell, R.E. Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, USA Researcher author Bianchi, C Istituto Nazionale di Geofisica e Vulcanologia Researcher author Bingham, Robert University of Edinburgh Researcher author Blankenship, Donald Institute for Geophysics, Jackson School of Geosciences, University of Texas Researcher author Casassa, G. Centro de Estudios Cientificos Researcher author Catania, Ginny University of Texas Researcher author Christianson, K Earth and Space Sciences, University of Washington Researcher author Conway, H Earth and Space Sciences, University of Washington Researcher author Corr, Hugh British Antarctic Survey Researcher author Cui, X. Polar Research Institute of China Researcher author Damaske, D Center for Marine Environmental Sciences, University Bremen Researcher author Damn, V. Federal Institute for Geosciences and Natural Resources Researcher author Drews, R. Tubingen University, Department of Geosciences Researcher author Eagles, G. Alfred-Wegener-Institut Helmholtz-Zentrum fur Polar und Meeresforschung Researcher author Eisen, O. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Eisermann, H. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Ferraccioli, Fausto British Antarctic Survey Researcher author Forsberg, Rene DTU Space Researcher author Franke, S Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Fujita, S. National Institute of Polar Research Researcher author Gim, Y. Jet Propulsion Laboratory. California Institute of Technology Researcher author Goel, V. National Centre for Polar Ocean Research (NCPOR) Researcher author Gogineni, P. University of Alabama Researcher author Greenbaum, J.S. Institute for Geophysics, Jackson School of Geosciences, University of Texas Researcher author Hills, B. Department of Earth and Space Sciences, University of Washington Researcher author Hindmarsh, Richard British Antarctic Survey Researcher author Holmlund, P. Stockholm University Researcher author Holschuh, N. Amherst College Researcher author Holt, J.W. University of Arizona Researcher author Humbert, A. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Jacobel, R. St. Olaf College Researcher author Jansen, D. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Jenkins, Adrian Northumbria University Researcher author Jokat, Wilfried Alfred Wegener Institute Helmholtz Center for Polar and Marine Research Researcher author Jordan, Tom British Antarctic Survey Researcher author King, Edward British Antarctic Survey Researcher author Kohler, Jack Norwegian Polar Institute Researcher author Krabill, W. NASA Wallops Flight Facility Researcher author Langley, K. Department of Geosciences, University of Oslo Researcher author Lee, J. Korean Polar Research Institute Researcher author Leitchenkov, G. Institute for Geology and Mineral Resources of the World Ocean Researcher author Leuschen, C. Centre for Remote Sensing of Ice Sheets, University of Kansas Researcher author Luyendyk, B. Earth Research Institute, University of California Researcher author MacGregor, J. Cryospheric Sciences Lab, NASA Goddard Space Flight Center Researcher author MacKie, E. Department of Geophysics, Stanford University Researcher author Matsuoka, Kenichi Norvegian Polar Institute Researcher author Morlighem, Mathieu Department of Earth Sciences, Dartmouth College Researcher author Mouginot, Jeremie Univeristy of California Researcher author Nitsche, Frank Lamont-Doherty Earth Observatory, Columbia University Researcher author Nogi, Y. National Institute of Polar Research, Tokyo, Japan Researcher author Nost, O. Norwegian Polar Institute Researcher author Paden, John Center for Remote Sensing of Ice Sheets (CReSIS), The University of Kansas Researcher author Pattyn, F. Laboratoire de Glaciologie, Universite Libre de Bruxelles Researcher author Popov, S. Polar Marine Geosurvey Expedition Researcher author Riger-Kusk, M. Western Norway University of Applied Sciences Researcher author Rignot, Eric University of California Researcher author Rippin, David University of York Researcher author Rivera, Andres Centro de Estudios Cientificos Researcher author Roberts, Jason University of Tasmania Researcher author Ross, Neil Newcastle University Researcher author Ruppel, A. Federal Institute for Geosciences and Natural Resources Researcher author Schroeder, Dustin Stanford University Researcher author Siegert, Martin Imperial College London Researcher author Smith, Andrew British Antarctic Survey Researcher author Steinhage, D. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Researcher author Studinger, M. NASA Goddard Space Flight Center Researcher author Sun, B. Polar Research Institute of China Researcher author Tabacco, I. Istituto Nazionale di Geofisica e Vulcanologia Researcher author Tinto, Kirsty Lamont Doherty Earth Observatory Researcher author Urbini, S. Istituto Nazionale di Geofisica e Vulcanologia Researcher author Vaughan, David British Antarctic Survey Researcher author Welch, B. St. Olaf College Researcher author Wilson, D.S. Marine Science Institute, University of California Researcher author Young, Duncan Institute for Geophysics, Jackson School of Geosciences, University of Texas Researcher author Zirizzotti, A. Istituto Nazionale di Geofisica e Vulcanologia 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 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 BEDMAP Elevation Ice thickness theme Antarctica place Elevation theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Creative Commons Attribution 4.0 International 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 and the Bedmap3 publication in any publication as follows: DATA: Fremand, A., Fretwell, P., Bodart, J., Pritchard, H., Aitken, A., Bamber, J., Bell, R. E., Bianchi, C., Bingham, R., Blankenship, D., Casassa, G., Catania, G., Christianson, K., Conway, H., Corr, H., Cui, X., Damaske, D., Damm, V., Drews, R., ... Zirizzotti, A. (2022). BEDMAP3 - Ice thickness, bed and surface elevation for Antarctica - standardised data points (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/91523FF9-D621-46B3-87F7-FFB6EFCD1847 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. url url crossReference url url largerWorkCitation doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference doi doi crossReference url url crossReference textTable eng utf8 elevation geoscientificInformation -180.0 180.0 -90.0 -60.0 1971-01-01 2020-12-31 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/csv bytes 7408818586 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=91523ff9-d621-46b3-87f7-ffb6efcd1847 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The primary source data consist of survey point measurements of ice thickness, bed elevation and surface elevation, which principally comes from airborne radar surveys and seismic soundings, and to a smaller extent from ground-based radar surveys. All the data have been standardised to a specific CSV format. The format consists of (i) an extended header section where (a) each line is introduced by a comment ("#") character, (b) each line contains a single header item, (c) the colon character (":") is used as the key/value separator, (d) units are in parentheses, (e) attributes preferably use a common vocabulary such as the CF convention and includes attributes from the ACDD; (ii) a header row composed of the column name following the CF convention and units in parentheses; and finally (iii) the data using comma as the separator. The extended header consists of general information regarding each campaign such as the year, the name of the main investigator, funding and processing details. The variable names are as follows: trajectory_id Line or Flight ID trace_number Trace number from the specific line given in Line_ID longitude Longitude (WGS84 EPSG: 4326) in decimal degrees latitude Latitude (WGS84 EPSG: 4326) in decimal degrees date Date following ISO 8601 format: YYYY: year, MM: month, DD: day time_UTC UTC time following ISO 8601 format: HH: hours, MM: minutes, SS: seconds surface_altitude Surface elevation or altitude (referenced to WGS84) in meters land_ice_thickness Ice thickness in meters bedrock_altitude Bed elevation or altitude (referenced to WGS84) in meters two_way_travel_time Two-way travel time in seconds aircraft_altitude Aircraft elevation or altitude when applicable (referenced to WGS84) in meters along_track_distance Distance in the along-track direction in meters Data quality: All non-value data were converted to -9999, including any negative ice thickness values and any points with clear outliers. We checked the minimum and maximum values of each field to ensure the data are in a reasonable range and calculated mean and standard deviation on each dataset to identify potential issues. For example, if longitude/latitude values did not fall within the expected -180 to 180 or -50 to -90 degrees range respectively, the entire row was removed. When no ice thickness values were provided but surface and bed elevation values existed, we simply calculated ice thickness by subtracting the surface value from the bed value. At times, bed elevation was higher than surface elevation, likely due to issues with the semi-automatic picker used to extract the surface and bed reflector or a lack of distinctive reflectors in areas of shallow ice. To prevent this affecting the gridded product, we converted these values to -9999 for both the surface and the bed. Finally, we also conducted routine checks on the ice thickness data by comparing the given ice thickness value with the inferred ice thickness calculated from subtracting surface with bed. If these did not match, we placed -9999 on the ice thickness values. File naming conventions were also used throughout to easily identify a specific dataset as follows: DataProvider_Year_CampaignName_TypeofData_BM3. The type of data used was separated into three categories: Airborne Radar (AIR), Ground-based Radar (GRN), and Seismic (SEI) data. The 'BM3' abbreviation at the end identifies the datasets was part of the Bedmap3 compilation to differentiate from the Bedmap 1 and 2 (BM1 and BM2) compilations. For instance, the file named 'NASA_2019_ICEBRIDGE_AIR_BM3.csv' refers to the ICEBRIDGE airborne campaign led by NASA in 2019. asNeeded completed