303d8002-712c-4979-b31b-54e421100def 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 2025-10-23 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 Aerial survey using a thermal sensor of the Grytviken/King Edward Point fur seal colony during the 2022/23 season, flight DPlus_109_45 2025-10-23 creation 2025-10-23 revision 2025-10-23 publication 2025-10-23 released 1.0 https://doi.org/10.5285/303d8002-712c-4979-b31b-54e421100def doi GB/NERC/BAS/PDC/02096 https://data.bas.ac.uk/ Please cite this item as: Fenney, N., Hollyman, P., Coleman, J., Fox, A., Trathan, P., & Collins, M. (2025). Aerial survey using a thermal sensor of the Grytviken/King Edward Point fur seal colony during the 2022/23 season, flight DPlus_109_45 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/303d8002-712c-4979-b31b-54e421100def Aerial survey using a thermal sensor of the Grytviken / King Edward Point fur seal colony during the 2022/23 season conducted using a RPAS (remotely piloted aerial system). The aerial survey was conducted as part of the Darwin Plus (DPLUS) 109 project: Initiating Monitoring Support for the Government of South Georgia and the South Sandwich Islands Marine Protected Area (SGSSI-MPA) Research and Monitoring Plan for the purpose of establishing a baseline population estimate of key indicator species around South Georgia. Dataset includes the original images and log files, the original RINEX GNSS (global navigation satellite system) base station files, the post-processed GNSS and imagery data, along with the resulting georeferenced DSM (digital surface model) and an orthorectified mosaic of the imagery. This dataset is from flight number DPLUS_109_45 which was carried out on 2022-11-15. This work was supported by the Overseas Territories Environment and Climate Fund under Grant Darwin Plus ref: DPLUS109: Initiating monitoring support for the SGSSI-MPA Research and Monitoring Plan. Funding for this work was also received from the UK Blue Belt fund through GSGSSI. No credit. completed Fenney, Nathan British Antarctic Survey Researcher author Hollyman, Philip Bangor University Researcher author Coleman, Jamie British Antarctic Survey Researcher author Fox, Adrian British Antarctic Survey Researcher author Trathan, Philip British Antarctic Survey Researcher author Collins, Martin 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 > Oceans > Marine Biology > Marine Mammals EARTH SCIENCE > Spectral/Engineering > Visible Wavelengths > Visible Imagery 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 Fur seal South Georgia aerial survey digital surface model drone orthorectified mosaic thermal theme King Edward Point South Georgia Island Grytviken South Georgia Island place Oceanographic geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions public access limited according to Article 13(1)(e) of the INSPIRE Directive 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 and supplied under Open Government Licence v.3 (). otherRestrictions Data under embargo until 31/12/2025. url url crossReference textTable eng utf8 biota imageryBaseMapsEarthCover -36.50986 -36.4907 -54.28485 -54.28153 2022-11-15 2022-11-15 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 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=303d8002-712c-4979-b31b-54e421100def WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Data collection: Aerial survey conducted using a RPAS (AgEagle eBee X) equipped with a AgEagle Duet T sensor. The Duet T sensor combined an RGB, 20 megapixel (MPx) S.O.D.A. (Sensor for Obstacle Detection and Avoidance) with a 640 x 512 Px thermal FLIR (Forward Looking Infrared) sensor for simultaneous thermal and RGB image collection. The aerial survey consisted of a single flight collecting overlapping imagery of the target area, with a minimum forward overlap of 80% and a side overlap of 60% (based on the specifications of the thermal sensor).Within the flight, five smaller discrete surveys were undertaken, with a single survey at KEP, followed by four repeat surveys of the same area at Grytviken. The KEP survey was conducted with a thermal Ground Sample Distance (GSD) of 10 cm, while the four repeat surveys at Grytviken were at four different GSD resolutions (8, 10, 12 and 14 cm). During the aerial surveys a geodetic Trimble GNSS base station receiver collected data. Post flight processing: Precise point positioning (PPP) was undertaken using the online Canadian Spatial Reference System PPP tool to generate the position of the base station during the survey and which was then used to process the eBee X's onboard GNSS receiver using post-processed kinematic (PPK) processing to improve the accuracy of the camera centres captured during flight. Photogrammetry / final outputs: The photogrammetry and orthorectification workflows were undertaken in Pix4D (version 4.7.5.). The photogrammetry workflow used the higher resolution RGB imagery to derive the position and orientation of both the RGB and thermal sensors during each image capture (x, y, z, omega, phi and kappa (or roll, pitch, yaw)). For each discrete survey, this information was then used to derive a series of dense 3D point clouds of the surface from the RGB images and from which a DSM (digital surface model) and a triangulated mesh could be created. The triangulated meshes were then used to orthorectify both the RGB and thermal imagery, removing camera perspective and terrain distortions, resulting in a series of geometrically corrected, georeferenced orthorectified image mosaics. Please refer to Coleman et al. for a more detailed description of the data collection and post processing methodologies. Data quality: PPP (precise point positioning) processing accuracy is reported in the CSRS (Canadian Spatial Reference System) PPP processing report (.pdf). PPK (post-processed kinematic) processing accuracy (by image) is reported in the eMotion camera centre geoinfo file (.txt). asNeeded completed