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Inferring ice-flow directions from single ice-sheet surface images using the Radon transform

Inferring ice-flow directions from single ice-sheet surface images using the Radon transform
Jason L. Roberts

Authors

Jason L Roberts
Australian Antarctic Division, Channel Highway, Kingston, Tasmania, 7050, Australia
and Antarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia

Roland C Warner
Australian Antarctic Division, Channel Highway, Kingston, Tasmania, 7050, Australia
and Antarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia

Adam Treverrow
Antarctic Climate & Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart, Tasmania 7001, Australia

Abstract

We present a new method for extracting the direction of surface flow for ice sheets, based on the detection of flow-induced features that are visible in satellite imagery. The orientation of linear features is determined using a Radon transform and only requires a single image. The technique is demonstrated by applying it to the RADARSAT mosaic of Antarctica, over the Lambert Glacier–Amery Ice Shelf region of East Antarctica. Comparisons with both existing flow-direction fields and traced streamlines over the same area provide an evaluation of the method. We also illustrate its application to Landsat 7 imagery.

Knowledge of the direction of ice flow in glaciers and ice sheets is useful in a variety of applications. These include defining drainage regions and delineating flowbands in mass-balance and modelling studies, reconstructing complete surface velocities from satellite interferometric synthetic aperture radar (InSAR) measurements and making along-flow interpolations.

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This page was last modified on 24 September 2013.