Measurement of ice-sheet topography using satellite-radar interferometry
Open Access
- 1 January 1996
- journal article
- Published by International Glaciological Society in Journal of Glaciology
- Vol. 42 (140), 10-22
- https://doi.org/10.3189/s0022143000030483
Abstract
Detailed digital elevation models (DEMs) do not exist for much of the Greenland and Antartic ice sheets. Radar altimetry is at present the primary, in many cases the only, source of topographic data over the ice sheets, but the horizontal resolution of such data is coarse. Satellite-radar interferometry uses the phase difference between pairs of synthetic aperture radar (SAR) images to measure both ice-sheet topography and surface displacement. We have applied this technique using ERS-1 SAR data to make detailed (i.e. 80 m horizontal resolution) maps of surface topography in a 100 km by 300 km strip in West Greenland, extending northward from just above Jakobshavns Isbræ. Comparison with а 76 km long line of airborne laser-altimeter data shows that We have achieved a relative accuracy of 2.5 m along the profile. These observations provide a detailed view of dynamically Supported topography near the margin of an ice sheet. In the final section We compare our estimate of topography with phase contours due to motion, and confirm our earlier analysis concerning vertical ice-sheet motion and complexity in ERS-1 SAR interferograms.This publication has 16 references indexed in Scilit:
- Accuracy of airborne laser altimetry over the Greenland ice sheetInternational Journal of Remote Sensing, 1995
- Observations of ice‐sheet motion in Greenland using satellite radar interferometryGeophysical Research Letters, 1995
- Detailed elevation map of Ice Stream C, Antarctica, using satellite imagery and airborne radarAnnals of Glaciology, 1994
- Satellite Radar Interferometry for Monitoring Ice Sheet Motion: Application to an Antarctic Ice StreamScience, 1993
- The TOPSAR interferometric radar topographic mapping instrumentIEEE Transactions on Geoscience and Remote Sensing, 1992
- State of balance of the cryosphereReviews of Geophysics, 1991
- Mapping small elevation changes over large areas: Differential radar interferometryJournal of Geophysical Research, 1989
- Satellite radar interferometry: Two‐dimensional phase unwrappingRadio Science, 1988
- Applications of the interaction of microwaves with the natural snow coverRemote Sensing Reviews, 1987
- Topographic mapping from interferometric synthetic aperture radar observationsJournal of Geophysical Research, 1986