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A method for sub-pixel scale feature-tracking using Radarsat images applied to the Mertz Glacier Tongue, East Antarctica

Citation

Giles, AB and Massom, RA and Warner, RC, A method for sub-pixel scale feature-tracking using Radarsat images applied to the Mertz Glacier Tongue, East Antarctica, Remote Sensing of Environment, 113, (8) pp. 1691-1699. ISSN 0034-4257 (2009) [Refereed Article]


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The definitive version is available at http://www.sciencedirect.com

DOI: doi:10.1016/j.rse.2009.03.015

Abstract

Tracking features between pairs of satellite synthetic aperture radar (SAR) images using image crosscorrelation methods is a powerful tool for defining regions of image movement such as ice flow of Antarctic glaciers. Unlike optical images, processed SAR images have various instrumental effects such as view angle distortions and lateral displacement errors caused by slant range mapping. Co-registration issues are problematic and need to be addressed if there are few/no suitable stationary tie points at or near sea level within the images. Methods are presented that use Radarsat ScanSAR images to reliably measure sub-pixel displacements with errors of ≲±0.25 pixels but this estimate is target dependent. The techniques and issues are illustrated using examples from a long-term study of the Mertz Glacier Tongue in East Antarctica. For image pairs only a few days apart, this extensive structure forms an excellent grid-like test pattern which provides up to 5000 valid correlation matches. Images separated by 100's of days can then be processed in the same way to reveal many subtle and some large changes over time. The technique described is robust and may be widely applicable.

Item Details

Item Type:Refereed Article
Keywords:Antarctica Ice sheet Satellite remote sensing Feature tracking Mertz Glacier Glacier flow
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Antarctic and Sub-Antarctic Oceanography
Author:Giles, AB (Dr Barry Giles)
Author:Massom, RA (Dr Robert Massom)
Author:Warner, RC (Dr Roland Warner)
ID Code:61740
Year Published:2009
Web of Science® Times Cited:21
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2010-03-05
Last Modified:2010-05-14
Downloads:4 View Download Statistics

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