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      Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry

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      General Information:

      Citation:
      Hawley, R. L. , Sheperd, A. , Cullen, R. , Helm, V. and Wingham, D. J. (2009): Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry , Geophysical Research Letters., 36 (L22501) . doi: 10.1029/2009GL040416
      Cite this page as:
      hdl:10013/epic.33644
      DOI:
      https://doi.org/10.1029/2009GL040416
      Official URL:
      https://doi.org/10.1029/2009GL040416
      Contact Email:
      Veit.Helm@awi.de
      Related Data:

      Abstract:

      Interferometric Radar Altimeters (IRA's) use dual receive antennas to overcome one of the spatial limitations of pulse-limited altimeters. In a conventional IRA measurement, the range and across-track direction of a scatterer are determined using the phase difference between the antennas. We demonstrate a method of determining multiple elevation points across a swath orthogonal to the instrument ground track in regions of steep terrain, such as ice-sheet margins. We use data from an airborne IRA (a prototype of the CryoSat-2 instrument), and compare the results to simultaneous Airborne Laser Scanner (ALS) observations. This application results in a 75-fold increase in measurement density compared to conventional radar altimetry. Along a ∼2.5 km ground track, the RMS departure between the IRA- and ALS-derived measurements was 1.67 m. Based on our result, although our approach is limited to areas of relatively steep slope, a 25- to 75-fold increase in elevation measurements could be achieved in coastal regions of Antarctica and Greenland with similar processing of CryoSat-2 data.

      Further Details:

      Item Type:
      Article
      Authors:
      Hawley, R. L. ; Sheperd, A. ; Cullen, R. ; Helm, Veit ; Wingham, D. J.
      Divisions:
      AWI Organizations > Geosciences > Glaciology
      Primary Division:
      Organizations
      Programs:
      Helmholtz Research Programs > PACES I (2009-2013) > TOPIC 1: The Changing Arctic and Antarctic > WP 1.1: Role of Ice Sheets in the Earth System
      Primary Topic:
      Helmholtz Programs > Basic Research
      Eprint ID:
      21155
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      Helmholtz-Zentrum für Polar-
      und Meeresforschung
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