BGS Hosted Metadata
Rock outcrop map of the Antarctic continent derived from Landsat 8 imagery
Shapefile map of exposed rock outcrops for the Antarctic continent. The map was produced via a new fully automated methodology for differentiating rock from snow, clouds and sea using Landsat 8 multispectral imagery. Data was merged with the existing Antarctic Digital Database rock outcrop dataset for areas for those areas where Landsat 8 tiles were unavailable (south of 82 deg 40 S).
Simple
- Date (Creation)
- 2016-07-26
- Date (Revision)
- 2016-07-26
- Date (Publication)
- 2016-07-26
- Date (released)
- 2016-07-26
- Edition
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None
- Unique resource identifier
- https://doi.org/10.5285/f7947381-6fd7-466f-8894-25d3262cbcf5
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/00901
- Codespace
- Other citation details
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Please cite this item as: Burton-Johnson, A., Black, M., Fretwell, P., & Kaluza-Gilbert, J. (2016). Rock outcrop map of the Antarctic continent derived from Landsat 8 imagery (Version None) [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/f7947381-6fd7-466f-8894-25d3262cbcf5
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role British Antarctic Survey Burton-Johnson, Alexander
Author British Antarctic Survey Fretwell, Peter
Author British Antarctic Survey/University of Hull Black, Martin
Author University of Birmingham
Kaluza-Gilbert, Joseph
Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Landsat
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Rock outcrop
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- Place
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Antarctica
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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Data released under Open Government Licence V3.0 :
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
-
- Geoscientific information
))
- Supplemental Information
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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.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Units of distribution
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bytes
- Transfer size
- 1
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=f7947381-6fd7-466f-8894-25d3262cbcf5 Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
The rock outcrop dataset was derived though automated image analysis of Landsat 8 data and provides an updated map of exposed rock in Antarctica at greatly improved accuracies compared to the previous dataset. Classification accuracy has been calculated to be 74 ±9% at 1 standard deviation error compared to 39 ±19% for the previous manually derived dataset.
The image analysis algorithm used to produce the updated dataset used an NDSI threshold, thermal infrared to blue ratio, thermal infrared threshold, an NDWI threshold and a coastal mask to identify sunlit rock whilst excluding sunlit snow, clouds and liquid water. In addition, a blue reflectance threshold, an NDWI threshold and a coastal mask were used to identify shaded rock whilst excluding shaded snow and liquid water. The extents of shaded and sunlit rock exposure were then merged. To produce the final dataset the exposed rock extents were merged with the previous manually derived dataset in areas lacking suitable Landsat 8 images at the time of analysis (most extensively south of 82°40 S). These polygons are identified within the attribute table of the shapefile under the field Source (the origin of each polygon identified as Manually derived or Landsat 8 automated rock outcrop identification). To aid this differentiation the field GRIDCODE; identifies automatically derived polygons as 1 and manually derived polygons as 0.
Data quality:
The rock outcrop dataset was derived though automated image analysis of Landsat 8 data and provides an updated map of exposed rock in Antarctica at greatly improved accuracies compared to the previous dataset. Classification accuracy has been calculated to be 74 ±9% at 1 standard deviation error compared to 39 ±19% for the previous manually derived dataset.
Metadata
- File identifier
- f7947381-6fd7-466f-8894-25d3262cbcf5 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2016-07-26
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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