e07d62bf-d58c-4187-a019-59be998939cc 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 2020-06-23 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 Airborne radio-echo sounding of the English Coast, western Palmer Land, Antarctic Peninsula (2016/17 season) 2020-06-23 creation 2020-06-23 revision 2020-06-23 publication 2020-06-23 released 1.0 https://doi.org/10.5285/e07d62bf-d58c-4187-a019-59be998939cc doi GB/NERC/BAS/PDC/01339 https://data.bas.ac.uk/ Please cite this item as: Corr, H., & Robinson, C. (2020). Airborne radio-echo sounding of the English Coast, western Palmer Land, Antarctic Peninsula (2016/17 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/e07d62bf-d58c-4187-a019-59be998939cc This dataset includes ~3,000 line km of radio-echo sounding data along the English Coast of western Palmer Land in the Antarctic Peninsula. Data was acquired by the British Antarctic Survey Polarimetric-radar Airborne Science Instrument (PASIN2) ice sounding radar system in the austral summer of 2016/2017. Radar lines collected at ~3-5 km line spacing transect a number of outlet glacier flows, close to the grounding line, where continental ice begins to float. Data were funded by a BAS National Capability grant. No credit. completed Corr, Hugh British Antarctic Survey 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 Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Sea Ice > Ice Depth/Thickness 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 Peninsula Antarctica PASIN Radar radio-echo sounding theme Ers Ice Stream Antarctica Envisat Ice Stream Antarctica Cryosat Ice Stream Antarctica Grace Ice Stream Antarctica Sentinel Ice Stream Antarctica Hall Glacier Antarctica Nikitin Glacier Antarctica Lidke Ice Stream Antarctica Landsat Ice Stream Antarctica English Coast of western Palmer Land 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 (). Please cite this dataset as follows: Corr, H., & Robinson, C. (2020). Airborne radio-echo sounding of the English Coast, western Palmer Land, Antarctic Peninsula (2016/17 season) (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/E07D62BF-D58C-4187-A019-59BE998939CC url url crossReference doi doi crossReference textTable eng utf8 elevation geoscientificInformation -80.04 -66.71 -74.74 -72.78 2017-01-19 2017-01-22 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 application/octet-stream bytes 4939212390 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e07d62bf-d58c-4187-a019-59be998939cc WWW:LINK-1.0-http--link Get Data Download data download bytes 4939212390 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=e07d62bf-d58c-4187-a019-59be998939cc WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The British Antarctic Survey Polarimetric-radar Airborne Science Instrument (PASIN2) ice sounding radar system operates at a frequency of 150 MHz, using a pulse-coded waveform at an effective acquisition rate of 312.5 Hz and a bandwidth of 13 MHz. Radio-echo sounding data were collected at an average flying velocity of 55 m s-1. Along-track processing of the data results in an output data rate of 5 Hz, which produces an average spacing between radar traces of 11 m. Range compressed data were processed using unfocused SAR. The ice/bed reflector was determined in PROMAX software, where the first-break picker tool was used to automatically determine the onset of the bed reflector. These picks were then manually assessed and corrected where necessary. An electromagnetic wave propagation speed in ice of 0.168 m ns-1 and a constant firn correction of 10 m were used for topographic correction. Ice thickness was calculated by subtracting surface elevation measurements (derived from radar/laser altimeters for aircraft terrain clearance) from bed reflector depth picks. Data description: The data is composed of three folders: - 4microseconds: Contains data designed to image the bed. Pulse length of 4 microseconds - 1microsecond: Contains data designed to enhance imaging of internal layers Pulse length of 1 microsecond Data for 4us and 1us are composed of both SEGY and TXT files. Column desciption of txt file: 1.traceNum, this is the SEGY trace number 2. PriNum, radar shot number 3. Time, in format YYYYMMDD T hhmmss.ddd 4. dateNum, in a convenient Matlab format 5. radSeg, radar file segment (20 second length) Name descriptions for segy are based on the original archive file names, so: fXXy_TxP1234_Rx1234_L4_ns1536_skip25_DBS5Hz fXXy_TxP1234_RxB_L1_C_ns1536_skip25_DBS5Hz fXX = flight number y = radar radar start/restart value i.e. a=1 continuous run, b=1 restart, 2=second restart etc. this is more a through back to old incarnations of pasin that used tapes and spinning disk that sometime caused the system to stop/freeze due write errors etc. we still include as it is useful for calibration flights are flights with varied setups. TxP1234=is which antennas did the transmitting [P=port, S=starboard, B=belly plus antenna numbers] Rx1234= is which antennas did the receiving [P=port, S=starboard, B=belly, plus antenna numbers, no number represents combining of antenna array] Lx=Length of transmit chirp i.e. 1us or 4us C=combined (if used) this is an addition from the raw data naming convention. ns1536=number of samples per trace during processing. (pri =64us, fs=24MHz) skip25=basically the decimation value when processing DBS5Hz=final presented data frequency i.e. 5Hz Navigation information is not held in the segy file header and can be derived from the bed pick files using traceNum or PriNum as a key to link the two datasets - Bed picks: Contains bed picks data. Channel description: 1.traceNum, this is the SEGY trace number 2. Lon, Longitude 3. Lat, Latitude 4. Time, in format YYYYMMDD T hhmmss.ddd 5. dateNum, in a convenient Matlab format 6. PriNum, radar shot number 7. Eht, height of aircraft above WGS84 ellipsoid (m) 8. terrainClear, height of aircraft above the terrain (m) 9. surfElev, height of ice surface above above WGS84 ellipsoid (m) 10. surfSource, source of elevation measurements 0 = lidar, 1 = interpolated lidar for gaps ~ 55 m, 2 = from ice sounding radar 11. bedElev, height of ice bed above above WGS84 ellipsoid (m). Derived from surface minus ice thickness 12. iceThick, ice thickness (m) 168 metres/microsecond was used and 10 metres added for firn. 13. surfPickEff, the ice surface sample for the onset of the surface return 14. botPickLoc, the sample location for the onset of the bed return 15. sampOffset, the fiducal or zero radar range-sample Data collection: Sample collection: British Antarctic Survey Polarimetric-radar Airborne Science Instrument (PASIN2) ice sounding radar system Processing: PROMAX asNeeded completed