6909792b-fadf-4de6-ac2a-d32fa76a8339 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 2020-06-03 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 Rectified airborne Lidar data over Thwaites Glacier catchment between 1st January and 30th December 2019 2020-06-03 creation 2020-06-03 revision 2020-06-03 publication 2020-06-03 released 1.0 https://doi.org/10.5285/6909792b-fadf-4de6-ac2a-d32fa76a8339 doi GB/NERC/BAS/PDC/01335 https://data.bas.ac.uk/ Please cite this item as: Jordan, T., & Robinson, C. (2022). Rectified airborne Lidar data over Thwaites Glacier catchment between 1st January and 30th December 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/6909792b-fadf-4de6-ac2a-d32fa76a8339 We present here the airborne Lidar data was collected over the Thwaites Glacier catchment and adjacent ice shelves during the 2018/19 and 2019/20 field seasons. The data was collected using a Riegl Q240i-80 scanning system mounted in the BAS aerogeophysically equipped twin otter aircraft. It provides a high resolution (0.2 to 0.4 points per m2), and high accuracy (~10 cm vertical) georeferenced and time stamped swath of surface elevation information. Each track is ~600 m wide. Such data provides critical information about how the surface of the Thwaites Glacier system is changing. The Thwaites 2019/20 aerogeophysical survey was carried out as part of the BAS National Capability contribution to the NERC/NSF International Thwaites Glacier Collaboration (ITGC) program, with additional funding for LIDAR data processing from the UK Foreign and Commonwealth Office. No credit. completed Jordan, Tom 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 Topography/Ice Sheet Topography EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Land Surface > Topography EARTH SCIENCE > Spectral/Engineering > Lidar 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 ITGC Ice surface Lidar Surface elevation Thwaites West Antarctica theme Thwaites Glacier Antarctica Dotson Ice Shelf Antarctica Crosson Ice Shelf Antarctica place Elevation Land cover 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: DATA REFERENCE Jordan, T., & Robinson, C. (2022). Rectified airborne Lidar data over Thwaites Glacier catchment between 1st January and 30th December 2019 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/6909792B-FADF-4DE6-AC2A-D32FA76A8339 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 url url dependency url url crossReference textTable eng utf8 elevation geoscientificInformation imageryBaseMapsEarthCover -114.2729 -67.7382 -79.6048 -66.87331 2019-01-26 2019-12-30 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 application/octet-stream application/vnd.las bytes 163208757248 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=6909792b-fadf-4de6-ac2a-d32fa76a8339 WWW:LINK-1.0-http--link Get Data Download data download bytes 163208757248 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=6909792b-fadf-4de6-ac2a-d32fa76a8339 WWW:LINK-1.0-http--link Get Data Download data download bytes 163208757248 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=6909792b-fadf-4de6-ac2a-d32fa76a8339 WWW:LINK-1.0-http--link Get Data Download data download bytes 163208757248 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=6909792b-fadf-4de6-ac2a-d32fa76a8339 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Lidar data was collected using a Riegl Q240i-80 scanning system mounted in the camera bay of the BAS geophysically equipped twin otter. Coincident attitude data was collected using an iMAR inertial navigation system (INS) (from Lamont Doherty Earth Observatory for the Jan 2019 season, and from BAS for the December 2019 season). Data processing was carried out by a sub-contractor (Terratec - https://terratec.no/en/). For each season (January and December) a boresight calibration was carried out using the Terrasolid software modules Terramatch and Terrascan. This calibration utilised a specific calibration data-set collected over the BAS Rothera Research Station. After calculation of the boresight values the remaining data for each season were processed using Riprocess with the appropriate boresight values. During the main survey data was collected on as many flights as possible, but due to operational constraints Lidar data is not available on all flights. As Lidar was not a priority, swaths do not typically overlap, so further calibration in the main survey area was not possible. The generally feature poor ice surface would also hamper such calibration. In addition it must be noted that removal of spikes due to clouds or other atmospheric returns has not been carried out. However, most flights were flown in clear weather. The list of variables is as follows: * longitude x - in degrees from the WGS84 datum * latitude y - in degrees from the WGS84 datum * altitude z - in meters * intensity - arbitrary value between -128/128 * scan_angle - in degrees * GPS_time * datetime_utc - converted GPS time to UTC taking into account leap seconds in YYYY-MM-DD HH:MM:SS Data quality: Analysis of repeat passes over the Runway suggests the corrected data has an internal accuracy of ~10 cm. Note no de-spiking, or removal of cloud features has been undertaken. asNeeded completed