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Abstract

The current shape and rate of change of the margins of the Antarctic ice sheet are poorly known. Since polar regions are inhospitable, remotely sensed images provide an invaluable data source for studying the ice margin. These images can be examined by a human expert or processed automatically by a computer. This paper describes the design and implementation of a semi-automated technique to trace ice margins in synthetic-aperture-radar images.

The technique is based on a deformable contour model derived from the active contour model of Kass et.al. (1988) and the discrete dynamic contour of Lobregt & Viergever (1995). The contour is initialised by the user, to approximate the margin, and the deformation process causes the contour to accurately mold itself to the shape of the margin.

The technique has been tested on a number of different images with acceptable results in most cases.

Item Type:	Article
Authors/Creators:	Collings, A and Williams, R and Young, ND and Hyland, G
Keywords:	Antarctic images, image analysis, line tracing, Antarctic ice margins
Journal or Publication Title:	International Journal of Remote Sensing
Publisher:	Unspecified
Additional Information:	This is a preprint of an article whose final and definitive form has been published in the INTERNATIONAL JOURNAL OF REMOTE SENSING (c) 2006 [copyright Taylor and Francis]; INTERNATIONAL JOURNAL OF REMOTE SENSING is available on-line at http://journalsonline.tandf.co.uk/
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