Margin of the Antarctic ice cover derived from Synthetic Aperture Radar images for the sector 79E-108EEntry ID: IceMargin_79E-108E
Abstract: Geographic location of the outer margin of the Antarctic ice cover for the sector between longitudes 79E and 108E, including margins of ice shelves, glaciers, and iceberg tongues. The data set does not in general include the grounding zone at the inland margin of the ice shelves or glaciers.
The margin was defined by interpretation of an image mosaic generated from Synthetic Aperture Radar data. ... The image mosaic was built using navigation data accompanying the SAR images to transform the images to a map projection. The image navigation data were adjusted so that overlapping images were registered to one another, the indivual images merged into a mosaic, and the overall process adjusted so that the mosaic was tied to the few ground control points available in this large sector. Two separate mosaics were used to span the whole sector.
The majority of the SAR data were acquired by the ERS-SAR instruments in August 1996, some ERS data were acquired in August 1993, and one Radarsat scene was acquired in September 1997. The data were pre-processed to produce a mosaic with a 100 m pixel size, and adjusted so that the majority of the coastline positions refer to the August 1996 epoch.
The location data are internally consistent, and extracted at nominally 200 m intervals. The external position accuracy is generally better than 600 m. The coverage is complete over the whole sector. The coordinate set includes some island/ice rise features. Two very large grounded icebergs are included.
Data are in an ascii arc/info export file format as geographic coordinates on the ITRF1996 system and contains attribute information.
ERS-SAR data, copyright ESA, 1993, 1996
Radarsat data, copyright Canadian Space Agency, Agence spatiale canadienne, 1997.
This work was completed as part of ASAC projects 454, 1125 and 2224 (ASAC_454, ASAC_1125 and ASAC_2224).
Start Date: 1993-08-01Stop Date: 1997-10-31
Latitude Resolution: 200m
Longitude Resolution: 200m
Quality The data are in Lambert Conformal Conic projection, described in the shapefile.
Access Constraints Refer to Australian Antarctic Division, Mapping Officer and/or Neal Young
Use Constraints This data set conforms to the PICCCBY Attribution License
Must include acknowledgement to sources of this data set.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 724 kb
Distribution Format: shapefiles
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2955
Email: Neal.Young at aad.gov.au
ACE CRC AND AUSTRALIAN ANTARCTIC DIVISION Private Bag 80
Province or State: Tasmania
Postal Code: 7001
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-02-11
Last DIF Revision Date: 2014-09-11
Future DIF Review Date: 2001-02-11