1a23bbc3-b73e-469d-b540-c6b6141de77e 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 2024-10-15 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 Spot heights of Signy Island (March 2015) 2024-10-15 creation 2024-10-15 revision 2024-10-15 publication 2024-10-15 released 1.0 https://doi.org/10.5285/1a23bbc3-b73e-469d-b540-c6b6141de77e doi GB/NERC/BAS/PDC/01920 https://data.bas.ac.uk/ Please cite this item as: Fenney, N., & Gerrish, L. (2024). Spot heights of Signy Island (March 2015) (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/1a23bbc3-b73e-469d-b540-c6b6141de77e Spot heights of Signy Island, derived using stereoscopic photogrammetry from VHR (very high resolution) In-Track stereo satellite imagery collected during March 2015. The spot heights were created to support the updated release of the British Antarctic Survey (BAS) Signy Island map (BAS, 2024) and represent a series of points containing x, y and z values of high points and peaks. The dataset is available as a 3D point shapefile and a GeoPackage. WorldView-3 satellite images (c) 2015 Maxar Technologies. No credit. completed Fenney, Nathan British Antarctic Survey Researcher author Gerrish, Laura 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 > Land Surface > Topography > Terrain Elevation EARTH SCIENCE > Land Surface > Topography > Topographical Relief EARTH SCIENCE > Land Surface > 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 Signy Island South Orkney Islands photogrammetry spot heights theme Signy Island Antarctica South Orkney Islands Antarctica place 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 Data supplied under Open Government Licence v3.0 otherRestrictions None url url largerWorkCitation url url crossReference url url crossReference textTable eng utf8 elevation geoscientificInformation -45.73562 -45.5359 -60.76531 -60.65757 2015-03-29 2015-03-29 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 application/zip application/octet-stream application/vnd.shp application/geopackage+sqlite3 bytes 235520 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1a23bbc3-b73e-469d-b540-c6b6141de77e WWW:LINK-1.0-http--link Get Data Download data download bytes 235520 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1a23bbc3-b73e-469d-b540-c6b6141de77e WWW:LINK-1.0-http--link Get Data Download data download bytes 235520 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1a23bbc3-b73e-469d-b540-c6b6141de77e WWW:LINK-1.0-http--link Get Data Download data download bytes 235520 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=1a23bbc3-b73e-469d-b540-c6b6141de77e WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Photogrammetry: The stereo VHR satellite images were processed in Socet GXP. Image triangulation was undertaken using a combination of known ground control points and automatically generated tie points. WorldView-3 satellite images (c) 2015 Maxar Technologies. Spot height extraction: Once the images were triangulated, spot heights were extracted using a stereoscopic monitor. For each spot height, x, y and z were determined. Coordinate reference system: WGS 84, EPSG 4326. For information regarding the vertical datum please see the Dataset Fields below. Dataset Fields: The dataset has attribute fields for height above the WGS84 ellipsoid (elev_wgs84 given in meters) and for Mean Sea Level (MSL) at Signy Research Station (elev_local given in meters). Signy MSL is defined in the following report, BAS Archive reference no. AD6/2H/2001/L1 'GPS Survey Field Report - 2001-02 Antarctic Field Season', but to summarise: MSL is defined by the tide gauge at Signy Station. To transform data from WGS84 to Signy MSL, apply a local correction factor of -32.235 m (MSL is below WGS84). To access the full field report, please contact British Antarctic Survey Archives service. Data collection: Source imagery: In-Track stereo WorldView-3 (Maxar) VHR (very high resolution) satellite imagery. WorldView-3 satellite images © 2015 Maxar Technologies. Photogrammetry software: Socet GXP (version 4.5.1.5) Data quality: Image triangulation during the Socet GXP photogrammetric workflow was undertaken using a combination of ground control points and automatically generated tie points. The ground control points provided a global geospatial reference and were sourced from an earlier GNSS (global navigation satellite system) survey conducted around Signy Island during the 2001/02 Antarctic field season. Identifying the original ground control points proved challenging due to the limited resolution of the satellite imagery and the duration of time that had passed between the original GNSS survey and the satellite capture. Points that could not be identified or no longer existed were removed. The average error across the remaining ground control points following image triangulation was around 0.5 m. Please refer to the original field report for an estimation of accuracy of the individual ground control points. BAS Archive reference no. AD6/2H/2001/L1 'GPS Survey Field Report - 2001-02 Antarctic Field Season'. asNeeded completed