Abstract:
A continuous contour dataset at 100 m intervals for all land south of 60degS, excluding the Balleny Islands. The vertical datum of the contours is EGM2008. Contours are extracted primarily from the PGC Reference Elevation Model of Antarctica (REMA) v1.1 with certain islands filled from Copernicus WorldDEM. Further small areas are interpreted from satellite imagery, and Peter I Oy contours are from the Norwegian Polar Institute. Sources of individual line segments are contained in the attribute table and full compilation information is given in the lineage statement.
Note: contours overlap the coastline in small areas, due to resolution of the data used in creation of the lines, and potential errors in coastline and/or contour data. Certain areas are known to contain erroneous data due to faults in the original DEM data.
Keywords:
Antarctic Digital Database, Antarctica, Elevation, Topographic mapping
Gerrish, L. (2020). High resolution vector contours for Antarctica - VERSION 7.3 (Version 7.3) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/4bd20a2b-df7d-46a2-acdf-5104c82ff4c7
| Use Constraints: | This information is licensed under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). To view this licence, visit https://creativecommons.org/licenses/by/4.0/ Please cite this item as: 'Gerrish, L., Fretwell, P., & Cooper, P. (2020). High resolution vector contours for Antarctica (7.3) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/571C967C-D007-45B3-B327-64D11CB496F4'. If using for a graphic or if short on space, please cite as 'data from the SCAR Antarctic Digital Database, accessed [year]' |
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| Creation Date: | 2020-10-22 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | PDC BAS |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Ms Laura Gerrish |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Original DEM sources and citations: REMA: Howat, I. M., Porter, C., Smith, B. E., Noh, M.-J., and Morin, P.: The Reference Elevation Model of Antarctica, The Cryosphere, 13, 665-674, https://doi.org/10.5194/tc-13-665-2019, 2019. Copernicus WorldDEM: produced using Copernicus WorldDEM-90 DLR e.V. 2010-2014 and Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved. Norwegian Polar Institute (2014). Map data / kartdata Peter I y 1:50 000 (P50 Kartdata). Norwegian Polar Institute. https://doi.org/10.21334/npolar.2014.29105abc |
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| Lineage: | All processing described here was performed in ArcGIS Pro version 2.6. A composite Digital Elevation Model (DEM) was created comprising of three datasets from the Reference Elevation Model of Antarctica v1.1: REMA_100m_peninsula_dem_filled, REMA_100m_dem and REMA_200m_dem_filled. These DEMs were first converted from ellipsoidal height to height above EGM2008 geoid and then mosaicked together in respective order at 100 m spatial resolution. This 100 m DEM was smoothed by performing Focal Statistics using a 3x3 cell size. 100 m contours were extracted and all contours with a height 1m were deleted, as well as erroneous offshore contours. All contour dangles were identified and then fixed to create a continuous dataset. They were fixed either by interpreting the correct line from satellite imagery or from Copernicus WorldDEM 90m contours. Such lines are attributed with interpreted in the source field and should be treated with caution. In other locations where the contours significantly overlapped the coastline, contours were redrawn/interpreted to not go offshore. In certain locations, primarily some islands on the Antarctic Peninsula, REMA data was insufficient to produce contours. In these places, contours were produced from the 'Copernicus WorldDEM 90m' DEM and smoothed by 300 m using a PAEK smoothing algorithm. Contours for Peter I Oy were incorporated from the Norwegian Polar Institute Data at 100 m intervals. The source of every line is written in the attribute table. All contours were merged together and lines 150 m in length were deleted. Further lines 1500 m were deleted in non-mountainous regions, so as to avoid deleting small mountain peak contours but to still simplify the main dataset. These regions were interpreted manually using the hillshade of the DEM used to produce the contours. |
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| Temporal Coverage: | |
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| Start Date | 1993-01-01 |
| End Date | 2020-10-30 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -90 |
| Northernmost | -60 |
| Longitude | |
| Westernmost | -180 |
| Easternmost | 180 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | N/A |
| Distribution: | |
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| Distribution Media | Online Internet (HTTP) |
| Distribution Size | 1326 MB |
| Distribution Format | SHP |
| Fees | N/A |
| Data Storage: | This dataset constains 2 files: - GeoPackage ~776.16 MB - Shapefile ~550.27 MB |