Paper Info
Title
Mapping of Ice Motion in Antarctica Using Synthetic-Aperture Radar Data
Abstract
Ice velocity is a fundamental parameter in studying the dynamics of ice sheets. Until recently, no complete mapping of Antarctic ice motion had been available due to calibration uncertainties and lack of basic data. Here, we present a method for calibrating and mosaicking an ensemble of InSAR satellite measurements of ice motion from six sensors: the Japanese ALOS PALSAR, the European Envisat ASAR, ERS-1 and ERS-2, and the Canadian RADARSAT-1 and RADARSAT-2. Ice motion calibration is made difficult by the sparsity of in-situ reference points and the shear size of the study area. A sensor-dependent data stacking scheme is applied to reduce measurement uncertainties. The resulting ice velocity mosaic has errors in magnitude ranging from 1 m/yr in the interior regions to 17 m/yr in coastal sectors and errors in flow direction ranging from less than 0.5 degrees in areas of fast flow to unconstrained direction in sectors of slow motion. It is important to understand how these mosaics are calibrated to understand the inner characteristics of the velocity products as well as to plan future InSAR acquisitions in the Antarctic. As an example, we show that in broad sectors devoid of ice-motion control, it is critical to operate ice motion mapping on a large scale to avoid pitfalls of calibration uncertainties that would make it difficult to obtain quality products and especially construct reliable time series of ice motion needed to detect temporal changes.
Year
DOI
Venue
2012
10.3390/rs4092753
REMOTE SENSING
Keywords
Field
DocType
Antarctica,InSAR,ice motion
Sea ice concentration,Satellite,Slow motion,Interferometric synthetic aperture radar,Synthetic aperture radar,Remote sensing,Ice sheet,Digital elevation model,Geology,Geodesy,Calibration
Journal
Volume
Issue
Citations 
4
9
15
PageRank 
References 
Authors
1.55
2
3
Name
Order
Citations
PageRank
j mouginot1203.08
Bernd Scheuchl2415.93
Eric J. M. Rignot338797.21