5c6447bc-7a49-4f0d-a782-3c542c2662ae 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 2020-06-30 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 Processed bed elevation picks from airborne radar depth sounding across East and West Antarctica (1966-1987) 2020-06-30 creation 2020-06-30 revision 2020-06-30 publication 2020-06-30 released 1.0 https://doi.org/10.5285/5c6447bc-7a49-4f0d-a782-3c542c2662ae doi GB/NERC/BAS/PDC/01357 https://data.bas.ac.uk/ Please cite this item as: BEDMAP 1 consortia (2020). Processed bed elevation picks from airborne radar depth sounding across East and West Antarctica (1966-1987)(Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5c6447bc-7a49-4f0d-a782-3c542c2662ae This is a collection of all vintage BAS radar data that went into BEDMAP 1 (Lythe and Vaughan, 2001) that have not been released so far as line data. BEDMAP data describes the thickness of the Antarctic ice sheet. They have been collected on surveys undertaken over the past 50 years and brought together into a single database. These data have allowed the compilation of a suite of seamless digital topographic models for the Antarctic continent and surrounding ocean. Data are provided as XYZ ASCII line data. No credit. completed BEDMAP 1 consortia 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 Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Sea Ice > Ice Depth/Thickness 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 Aerogeophysics Antarctica Radar Surface elevation theme East and West Antarctica Antarctica place Elevation Oceanographic geographical features 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: BEDMAP 1 Consortia. (2020). Processed bed elevation picks from airborne radar depth sounding across East and West Antarctica (1966-1987) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/5C6447BC-7A49-4F0D-A782-3C542C2662AE 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 doi doi crossReference doi doi crossReference textTable eng utf8 elevation geoscientificInformation -109.4573 -41.3575 -86.0132 -61.94419 1966-12-27 1988-02-10 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 bytes 65011712 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=5c6447bc-7a49-4f0d-a782-3c542c2662ae WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: RESPAC was the British Antarctic Survey radio-echo sounding database. It included data collected by BAS from 1966 to 1987. A number of different radar systems were used to collect ice thickness and navigation data during these campaigns. All data in RESPAC was incorporated into both the BEDMAP1 (Lythe et al. 2001) and Bedmap2 (Fretwell et al. 2013) compilations. Here we provide basic channels containing information on flight line, data-point location, and ice thickness measurements which are described in the table below. It should be noted that early surveys (prior to 1987) did not use GPS positioning, but were located using a variety of methods such as celestial navigation, inertial avionics (INS), Doppler avionics and dead-reckoning. Furthermore, various processes of "refixing" were applied to most flightlines, with distributed navigational uncertainties through the flight and at fixed points during the flight to the map-position of known landmarks. In summary, all navigational data have large positional uncertainties of up to ~5 km (Drewry, 1983). It is assumed that all radar data processing is accurate and consistent; however, we do not consider it reasonable to make estimates of change in ice thickness from this dataset without considering the potential large navigation errors, varied collection systems and processing steps. Data is available in a single file, split by the field season in which it was collected. For example, data from the 1966/67 field season will appear as L6667 (line) in the database. Channel description: Basic Channels Name Description Current_record Linear time in seconds since 1st Jan 1950. Season Season in which survey flights were undertaken Lon Longitude WGS 1984 Lat Latitude WGS 1984 x x projected meters, coordinate system- Polar stereographic y y projected meters, coordinate system- Polar stereographic Height_WGS1984 Aircraft altitude (meters) in WGS 1984 Radar tIce Ice thickness (m) SurfElev Ice surface elevation (m) BedElev Bed elevation (m) *Projected coordinates (x and y) are in Polar Stereographic: Latitude of natural origin: -71 Longitude of natural origin: 0 Scale factor at natural origin: 0.994 False easting 0 False northing 2072760.109 asNeeded completed