[Keyword='Amery Ice Shelf']
Amery Ice Shelf Grounding Zone defined as interpreted slope break in MODIS imagesEntry ID: aad_ais_gz_modis_slope_break
Abstract: Grounding Zone of the Amery Ice Shelf, East Antarctica defined by break of surface slope as determined through interpretation of MODIS images. It defines the landward edge of the grounding zone and therefore the maximum extent of the ice shelf.
The MODIS data from the 250 m Channel 2 were processed to a reflectance product and remapped to a Polar Stereographic Projection. The image contrast was ... stretched so that subtle variations in reflectance could be perceived. The variation in reflectance was used as an indicator of variation in slope. The break of slope of the snow surface was picked interactively on an image display at a frequency sufficient to define the shape of the grounding zone margin. The series of points are provided as a Point shapefile file as well as a set of arcs connecting the points. The point positions are given in geographic coordinates.
This work was completed as part of ASAC projects 2224 and 3067 (ASAC_2224, ASAC_3067).
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Data Set Citation
Dataset Originator/Creator: Neal Young
Start Date: 2003-11-02Stop Date: 2003-11-02
Latitude Resolution: 0.0002 degrees
Longitude Resolution: 0.0005 degrees
ISO Topic Category
Quality The position of the grounding zone was determined by visual inspection and manual digitisation of features in MODIS images that are interpreted as being the break of surface slope. Quality is lower for the south-west sector where the interpretation is less certain. The locations will delineate the probable maximum extent of the Amery Ice Shelf. In any case the line is expected to define the landward edge of the grounding zone.
Data are stored unprojected.
Access Constraints The dataset is available for download from the URL given below.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at the URL below when using these data.
Notify the author / investigator whenever the data are retrieved from the Data Centre, and of use in publication. Source of this data needs to be acknowledged when used.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 34 KB
Distribution Format: ascii, csv, 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
Galton-Fenzi, B.K., C. Maraldi, R. Coleman, J. Hunter, 2008, The Cavity under the Amery Ice Shelf, East Antarctica, Journal of Glaciology, 54(188), 881-887.
Creation and Review Dates
DIF Creation Date: 2009-06-09
Last DIF Revision Date: 2009-07-20