Abstract:
The dataset consists of three shapefiles containing terminus positions of the Koge Bugt North, Koge Bugt Central, and Koge Bugt South glaciers respectively, between 2022-2023. The terminus positions were manually digitised using either Landsat-8 or Landsat-9 imagery, downloaded from the USGS Earth Explorer (https://earthexplorer.usgs.gov/). If suitable optical imagery was unavailable, MEaSUREs Sentinel-1A and Sentinel-1B synthetic aperture radar (SAR) mosaics were employed, downloaded from the National Snow and Ice Data Center (NSIDC; Joughin, 2021). The dataset comprises 71 terminus positions in total, each digitised from imagery collected between 2022-01-11 and 2023-12-08.
Hannah Picton acknowledges funding from the E4 DTP (Edinburgh Earth, Ecology and Environment Doctoral Training Partnership), NE/S007407/1.
Keywords:
Greenland, Koge Bugt, ice dynamics, outlet glacier, terminus position
Picton, H. (2025). Terminus Positions of the Koge Bugt North, Koge Bugt Central and Koge Bugt South Glaciers 2022-2024 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/7453aea4-5798-4778-96e3-97b5281ae095
| Access Constraints: | Under embargo until publication of associated article. |
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| Use Constraints: | Data supplied under Open Government Licence v3.0 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
| Creation Date: | 2025-05-16 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK Polar Data Centre |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Hannah J Picton |
| Role(s) | Technical Contact, Investigator |
| Organisation | University of Edinburgh |
| Parent Dataset: | N/A |
| Reference: | Associated publication: Picton, H. et al. Multi-year ice dynamics at Koge Bugt Central glacier controlled by bed topography.Geophysical Research Letters (to be submitted). Other references: Black, T. and Joughin, I. (2022) MEaSUREs Weekly to Monthly Greenland Outlet Glacier Terminus Positions from Sentinel-1 Mosaics, Version 1 [dataset], National Snow and Ice Data Center. https://doi.org/10.5067/DGBOSSIULSTD. Black, T. and Joughin, I. (2023) Weekly to monthly terminus variability of Greenland's marine-terminating outlet glaciers. The Cryosphere, 17(1): 1-13. https://doi.org/10.5194/tc-17-1-2023. Joughin, I. (2021) MEaSUREs Greenland Image Mosaics from Sentinel-1A and -1B, Version 4 [dataset], National Snow and Ice Data Center. https://doi.org/10.5067/WXQ366CP8YDE. |
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| Quality: | Black and Joughin (2023) state that the typical uncertainty associated with such manually digitised terminus positions is typically 25 m, however this may be higher at heavily crevassed termini, or at tidewater glaciers which discharge into adjacent melange or sea ice. A quality flag is thus provided for each individual shapefile; a value of 0 indicates certainty regarding the digitisation, whilst a value of 1 indicates the uncertainty may be greater than 25 m. | |
| Lineage/Methodology: | Each terminus position was manually digitised within QGIS using Landsat-8 or Landsat-9 images downloaded from the USGS Earth Explorer (https://earthexplorer.usgs.gov/). If suitable optical imagery was unavailable, MEaSUREs Sentinel-1A and Sentinel-1B synthetic aperture radar (SAR) mosaics were employed, downloaded from the National Snow and Ice Data Center (NSIDC; Joughin, 2021). The details of the specific image from which a given terminus position was digitised is provided in the attribute table of the respective shapefile. These details will also be provided within the supplementary material of the associated publication for this dataset. | |
| Temporal Coverage: | |
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| Start Date | 2022-01-11 |
| End Date | 2023-12-08 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | 64.5 |
| Northernmost | 65.2 |
| Longitude | |
| Westernmost | -41.5 |
| Easternmost | -40.2 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Greenland |
| Detailed Location | Koge Bugt |
| Sensor(s): |
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| Data Collection: | QGIS (Version 3.22.8-Bialowieza). USGS Earth Explorer (https://earthexplorer.usgs.gov/). |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 233 kB |
| Distribution Format | SHP |
| Fees | N/A |
| Data Storage: | A 'READ ME' text file is provided, outlining details of the dataset and defining the variables provided for each given terminus position. The manually digitised terminus positions are provided as individual lines within the respective shapefiles: KOGE_BUGT_N_TP_2022_2024 KOGE_BUGT_C_TP_2022_2024 KOGE_BUGT_S_TP_2022_2024 |