Calculation and error analysis of a digital elevation model of Hofsjökull, Iceland, from SAR interferometry
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Abstract
Two ascending European Space Agency (ESA) Earth Resources Satellites (ERS)-1/-2 tandem-mode, synthetic aperture radar (SAR) pairs are used to calculate the surface elevation of Hofsjokull, an ice cap in central Iceland. The motion component of the interferometric phase is calculated using the 30 arc-second resolution USGS GTOPO30 global digital elevation product and one of the ERS tandem pairs. The topography is then derived by subtracting the motion component from the other tandem pair. In order to assess the accuracy of the resultant digital elevation model (DEM), a geodetic airborne laser-altimetry swath is compared with the elevations derived from the interferometry. The DEM is also compared with elevations derived from a digitized topographic map of the ice cap from the University of Iceland Science Institute. Results show that low temporal correlation is a significant problem for the application of interferometry to small, low-elevation ice caps, even over a one-day repeat interval, and especially at the higher elevations. Results also show that an uncompensated error in the phase, ramping from northwest to southeast, present after tying the DEM to ground-control points, has resulted in a systematic error across the DEM.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Calculation and error analysis of a digital elevation model of Hofsjokull, Iceland, from SAR interferometry |
| ISBN | 0-920081-21-5 |
| Year Published | 1999 |
| Language | English |
| Publisher | Eastern Snow Conference |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 8 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the fifty-sixth annual Eastern snow conference |
| First page | 5 |
| Last page | 12 |
| Conference Title | Fifty-sixth annual Eastern snow conference |
| Conference Location | Fredericton, NB |
| Conference Date | June 2-4, 1999 |
| Country | Iceland |
| Other Geospatial | Hofsjökull Ice Cap |
| Google Analytic Metrics | Metrics page |