f7947381-6fd7-466f-8894-25d3262cbcf5 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 2016-07-26 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 Rock outcrop map of the Antarctic continent derived from Landsat 8 imagery 2016-07-26 creation 2016-07-26 revision 2016-07-26 publication 2016-07-26 released None https://doi.org/10.5285/f7947381-6fd7-466f-8894-25d3262cbcf5 doi GB/NERC/BAS/PDC/00901 https://data.bas.ac.uk/ Please cite this item as: Burton-Johnson, A., Black, M., Fretwell, P., & Kaluza-Gilbert, J. (2016). Rock outcrop map of the Antarctic continent derived from Landsat 8 imagery (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/f7947381-6fd7-466f-8894-25d3262cbcf5 Shapefile map of exposed rock outcrops for the Antarctic continent. The map was produced via a new fully automated methodology for differentiating rock from snow, clouds and sea using Landsat 8 multispectral imagery. Data was merged with the existing Antarctic Digital Database rock outcrop dataset for areas for those areas where Landsat 8 tiles were unavailable (south of 82 deg 40 S). No credit. completed Burton-Johnson, Alexander British Antarctic Survey Researcher author Fretwell, Peter British Antarctic Survey Researcher author Black, Martin British Antarctic Survey/University of Hull Researcher author Kaluza-Gilbert, Joseph University of Birmingham 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 > Solid Earth > Rocks/Minerals 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 Landsat Rock outcrop theme Antarctica place Geology 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 Data released under Open Government Licence V3.0 : url url crossReference url url crossReference textTable eng utf8 geoscientificInformation -180.0 180.0 -87.43 -53.96 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 bytes 1 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=f7947381-6fd7-466f-8894-25d3262cbcf5 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The rock outcrop dataset was derived though automated image analysis of Landsat 8 data and provides an updated map of exposed rock in Antarctica at greatly improved accuracies compared to the previous dataset. Classification accuracy has been calculated to be 74 ±9% at 1 standard deviation error compared to 39 ±19% for the previous manually derived dataset. The image analysis algorithm used to produce the updated dataset used an NDSI threshold, thermal infrared to blue ratio, thermal infrared threshold, an NDWI threshold and a coastal mask to identify sunlit rock whilst excluding sunlit snow, clouds and liquid water. In addition, a blue reflectance threshold, an NDWI threshold and a coastal mask were used to identify shaded rock whilst excluding shaded snow and liquid water. The extents of shaded and sunlit rock exposure were then merged. To produce the final dataset the exposed rock extents were merged with the previous manually derived dataset in areas lacking suitable Landsat 8 images at the time of analysis (most extensively south of 82°40 S). These polygons are identified within the attribute table of the shapefile under the field Source (the origin of each polygon identified as Manually derived or Landsat 8 automated rock outcrop identification). To aid this differentiation the field GRIDCODE; identifies automatically derived polygons as 1 and manually derived polygons as 0. Data quality: The rock outcrop dataset was derived though automated image analysis of Landsat 8 data and provides an updated map of exposed rock in Antarctica at greatly improved accuracies compared to the previous dataset. Classification accuracy has been calculated to be 74 ±9% at 1 standard deviation error compared to 39 ±19% for the previous manually derived dataset. asNeeded completed