Antarctic iceberg sizes and spatial distribution from SAR image analysisEntry ID: AAD_Ant_iceberg_SAR
Abstract: This map shows the distribution of the iceberg data extracted from ERS SAR images.
Icebergs are identified in Synthetic Aperture Radar [SAR] images by image analysis using the texture and intensity of the microwave backscatter observations. The images are segmented using an edge detecting algorithm, and segments identified as iceberg or background, which may be sea ice, open water, ... or a mixture of both. Dimensions of the icebergs are derived by spatial analysis of the corresponding image segments. Location of the iceberg is derived from its position within the image and the navigation data that gives the location and orientation of the image.
More than 20,000 individual observations have been extracted from SAR images acquired by the European Space Agency's ERS-1 and 2 satellites and the Canadian Space Agency's Radarsat satellite. Because images can overlap, some proportion of the observations represent multiple observations of the same set of icebergs.
Most observations relate to the sector between longitudes 70E and 135E. The data set includes observations from several other discrete areas around the Antarctic coast. In general observations are within 200 km of the coast but in limited areas extend to about 500 km from the coast.
This metadata record has been derived from work performed under the auspices of ASAC project 2187 (ASAC_2187).
The map in the pdf file shows the extent of the coverage of individual SAR scenes used in the analysis and the abundance and size characteristics (by a limited colour palette) of the identified icebergs.
(Click for Interactive Map)
Start Date: 1991-09-01
Latitude Resolution: 30m
Longitude Resolution: 30m
Access Constraints Data available on request to Ray Williams or Neal Young, subject to agreement on application.
PDF version of the map is available for download from the URL given below.
Use Constraints This data set conforms to the PICCCBY Attribution License
Must be cited correctly.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 1,119 kb
Distribution Format: pdf
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
Phone: +61 3 6324 3480
Fax: +61 3 6324 3368
Email: R.Williams at utas.edu.au
SCHOOL OF COMPUTING PO BOX 1214 University of Tasmania
Province or State: Tasmania
Postal Code: 7250
Young, N.W., D. Turner, G. Hyland and R.N. Williams (1998) Near coastal iceberg distributions in East Antarctica 50E - 145E. Annals of Glaciology 27, 68-74.
Williams, R.N., Rees, G. and Young, N.W. (1999) A technique for the identification and analysis of icebergs in synthetic aperture radar images of Antarctica. International Journal of Remote Sensing, 20 (15 and 16), 3183-3199.
Creation and Review Dates
DIF Creation Date: 2001-05-29
Last DIF Revision Date: 2008-07-22