NERC Data Catalogue Service
BEDMAP1 - Ice thickness, bed and surface elevation for Antarctica - standardised shapefiles and geopackages
We present here the Bedmap1 ice thickness, bed and surface elevation aggregated points. The aggregated points consist of statistically-summarised shapefile points (centred on a continent-wide 500 m x 500 m grid) that reports the average values of Antarctic ice thickness, bed and surface elevation from the full-resolution survey data and information on their distribution. The points presented here correspond to the points used to grid Bedmap1.
The data comes from 127 individual surveys. They are available as geopackages and shapefiles.
The associated Bedmap datasets are listed here: https://www.bas.ac.uk/project/bedmap/#data
This work is supported by the SCAR Bedmap project and the British Antarctic Survey''s core programme: National Capability - Polar Expertise Supporting UK Research
Simple
- Alternate title
- Polar Data Centre (PDC) record GB/NERC/BAS/PDC/01620
- Date (Publication)
- 2023-02-13
- Identifier
- http://www.antarctica.ac.uk/dms/metadata.php?id= / GB/NERC/BAS/PDC/01620
- Maintenance and update frequency
- unknown Unknown
- Keywords
-
- NDGO0001
- NERC OAI Harvesting
-
- NERC_DDC
- GCMD Parameter Valids
-
- EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets
- EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation
- EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness
- EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Topography/Ice Sheet Topography
- BAS Free-text keywords
-
- Antarctica
- BEDMAP
- Elevation
- Ice thickness
- Use limitation
-
This data is covered by a Creative Commons License (https://creativecommons.org/licenses/by/4.0/) Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:
1. To cite the data and the Bedmap1 publication in any publication as follows:
REFERENCE:
Lythe, M. B. and Vaughan, D. G.: BEDMAP: A new ice thickness and subglacial topographic model of Antarctica, Journal of Geophysical Research: Solid Earth, 106, 11335-11351, https://doi.org/10.1029/2000JB900449, 2001.
DATA:
Lythe, M., Vaughan, D., BEDMAP 1, consortia, Fremand, A., & Bodart, J. (2022). BEDMAP1 - Ice thickness, bed and surface elevation for Antarctica - standardised shapefiles and geopackages (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/925AC4EC-2A9D-461A-BFAA-6314EB0888C8
2. The user recognizes the limitations of data. Use of the data is at the users'' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.
- Access constraints
- otherRestrictions Other restrictions
- Other constraints
-
This data is covered by a Creative Commons License (https://creativecommons.org/licenses/by/4.0/) Further by downloading this data the user acknowledges that they agree with the NERC data policy (http://www.nerc.ac.uk/research/sites/data/policy.asp), and the following conditions:
1. To cite the data and the Bedmap1 publication in any publication as follows:
REFERENCE:
Lythe, M. B. and Vaughan, D. G.: BEDMAP: A new ice thickness and subglacial topographic model of Antarctica, Journal of Geophysical Research: Solid Earth, 106, 11335-11351, https://doi.org/10.1029/2000JB900449, 2001.
DATA:
Lythe, M., Vaughan, D., BEDMAP 1, consortia, Fremand, A., & Bodart, J. (2022). BEDMAP1 - Ice thickness, bed and surface elevation for Antarctica - standardised shapefiles and geopackages (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/925AC4EC-2A9D-461A-BFAA-6314EB0888C8
2. The user recognizes the limitations of data. Use of the data is at the users'' own risk, and there is no warranty as to the quality or accuracy of any data, or the fitness of the data for your intended use. The data are not necessarily fully quality assured and cannot be expected to be free from measurement uncertainty, systematic biases, or errors of interpretation or analysis, and may include inaccuracies in error margins quoted with the data.
- Metadata language
- EnglishEnglish
- Topic category
-
- Elevation
- Geoscientific information
))
- Begin date
- 1966-01-01
- End date
- 2000-12-31
- Reference system identifier
- OGP / urn:ogc:def:crs:EPSG::4326
- Distribution format
-
- Protocol
- http
- Name
- GET DATA
- Function
- download Download
- Hierarchy level
- dataset Dataset
Domain consistency
- Measure identification
- INSPIRE / Conformity_001
Conformance result
- Date
- Explanation
- See the referenced specification
- Pass
- No
- Statement
- All non-value data were converted to -9999, including any negative ice thickness values and any points with clear outliers. We checked the minimum and maximum values of each field to ensure the data are in a reasonable range and calculated mean and standard deviation on each dataset to identify potential issues. For example, if longitude/latitude values did not fall within the expected -180 to 180 or -50 to -90 degrees range respectively, the entire row was removed. When no ice thickness values were provided but surface and bed elevation values existed, we simply calculated ice thickness by subtracting the surface value from the bed value. At times, bed elevation was higher than surface elevation, likely due to issues with the semi-automatic picker used to extract the surface and bed reflector or a lack of distinctive reflectors in areas of shallow ice. To prevent this affecting the gridded product, we converted these values to -9999 for both the surface and the bed. Finally, we also conducted routine checks on the ice thickness data by comparing the given ice thickness value with the inferred ice thickness calculated from subtracting surface with bed. If these did not match, we placed -9999 on the ice thickness values.
- File identifier
- GB_NERC_BAS_PDC_01620 XML
- Metadata language
- EnglishEnglish
- Hierarchy level
- dataset Dataset
- Date stamp
- 2023-02-13
- Metadata standard name
- NERC profile of ISO19115:2003
- Metadata standard version
- 1.0
Overviews
Spatial extent
Provided by
