afba710f-dab1-4a63-867b-520177388224 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 2019-09-12 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 A bathymetric compilation of Ascension Island, 2000-2017 2019-09-12 creation 2019-09-12 revision 2019-09-12 publication 2019-09-12 released 1.0 https://doi.org/10.5285/afba710f-dab1-4a63-867b-520177388224 doi GB/NERC/BAS/PDC/01236 https://data.bas.ac.uk/ NE/J023051/1 award NE/J020303/1 award Please cite this item as: Fremand, A., & Barnes, D. (2019). A bathymetric compilation of Ascension Island, 2000-2017 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/afba710f-dab1-4a63-867b-520177388224 We present a new bathymetric compilation around Ascension Island here defined by the following bounding box: 14.57 to 14.17 W, 8.12 to 7.75 S. This bathymetry grid was compiled from a variety of multibeam swath bathymetry data acquired during 4 different cruises (see lineage). The data is available as a grid of approximately 50 m resolution in two different formats: a GMT-compatible (2-D) NetCDF and Arc/Info and ArcView ASCII grid format using geographic coordinates on the WGS84 datum. Funding was provided by NERC grants NE/J023051/1 and NE/J020303/1 No credit. completed Fremand, Alice British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation Researcher author Barnes, David British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation 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 > Oceans > Bathymetry/Seafloor Topography > Bathymetry EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Water Depth EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography 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 Ascension Island Bathymetry Multibeam theme Ascension Island St Helena place 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 Fremand, A.C. (2019) and Barnes, D. A bathymetric compilation of Ascension Island, 2000-2017. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. 2. The user recognizes the limitations of data and will not use this data for navigation purposes. 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 oceans -14.57 -14.17 -8.12 -7.75 2000-01-01 2017-12-31 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/plain application/x-hdf5 application/x-hdf bytes 8808038 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=afba710f-dab1-4a63-867b-520177388224 WWW:LINK-1.0-http--link Get Data Download data download bytes 8808038 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=afba710f-dab1-4a63-867b-520177388224 WWW:LINK-1.0-http--link Get Data Download data download bytes 8808038 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=afba710f-dab1-4a63-867b-520177388224 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The multibeam swath bathymetry data were collected on scientific cruises undertaken by British Antarctic Survey (BAS) on RRS James Clark Ross: JR53-AMT11, JR287, JR15001 and JR16-NG. The grid was created using the mbgrid program from MB-system version 5.5.2336 , using the parameters " -E0.0005/0.0005/degrees! -G4 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for Arc/Info and ArcView ASCII grid and " -E0.0005/0.0005/degrees! -G3 -A2 -F1 -R-14.57/-14.17/-8.12/-7.75" for the netCDF file. This uses a Gaussian weighted mean filter and the bathymetry is gridded as topography (positive upwards) Data quality: Quality control was undertaken manually to remove any outliers in the source datasets. This involved cleaning much of the raw data using the "mbedit" command from MB-system. asNeeded completed