Skip to main content
×
×
Home

An image-enhanced DEM of the Greenland ice sheet

  • Ted A. Scambos (a1) and Terry Haran (a1)
Abstract

We have assembled an elevation grid for the Greenland ice sheet using a combination of the best current digital elevation model (DEM) (Bamber and others, 2000a, 2001) and 44 Advanced Very High Resolution Radiometer satellite images acquired in spring 1997. The images are used to quantitatively enhance the representation of surface undulations through photoclinometry. Gridcell spacing of the new DEM is 625 m. To validate the new DEM, we compared profiles extracted from it and the Bamber and others DEM with airborne laser altimetry profiles collected in the 1990s by the Airborne Topographic Mapper (Krabill and others, 1995). The image-enhanced DEM has a greatly improved representation of decameter-relief surface features <15 km in lateral extent, and reduces the mean elevation error in regions having these features by 20–50%. Root-mean-squared errors are typically 7–15m in the Bamber DEM, and 4–10m after image enhancement. However, the photoclinometry process adds some noise. In very smooth portions of the ice sheet where decameter undulationsare absent, the photoclinometry process caused a slight increase in the rms error, from ~1 min the Bamber and others DEM to ∼2.5 min the image-enhanced DEM. The image-enhanced DEM will be useful for inferring accumulation-rate variations over the undulation field, or for improving maps of bedrock elevation through inversion of surface elevation, for example. We briefly explore the preliminary steps of this latter application.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      An image-enhanced DEM of the Greenland ice sheet
      Available formats
      ×
      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      An image-enhanced DEM of the Greenland ice sheet
      Available formats
      ×
      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      An image-enhanced DEM of the Greenland ice sheet
      Available formats
      ×
Copyright
References
Hide All
Balise, M.J. and Raymond, C.F.. 1985. Transfer of basal sliding variations to the surface of a linearly viscous glacier. J. Glaciol., 31(109), 308–318.
Bamber, J.L., Ekholm, S. and Krabill, W.B.. 1998. The accuracy of satellite radar altimeter data over the Greenland ice sheet determined from airborne laser data. Geophys. Res. Lett., 25(16), 3177–3180.
Bamber, J.L., Hardy, R.J. and Joughin, I.. 2000a. An analysis of balance velocities over the Greenland ice sheet and comparison with synthetic aperture radar interferometry. J. Glaciol., 46(152), 67–74.
Bamber, J.L., Vaughan, D.G. and Joughin, I.. 2000b. Widespreadcomplex flow in the interior of the Antarctic ice sheet. Science, 287(5456), 1248–1250.
Bamber, J.L., Ekholm, S. and Krabill, W.B.. 2001. A new, high-resolution digital elevation model of Greenland fully validated with airborne laser altimeter data. J. Geophys. Res., 106(B4), 6733–6746.
Bindschadler, R.A. and Vornberger, P.L.. 1994. Detailed elevation map of Ice Stream C, Antarctica, using satellite imagery and airborne radar. Ann. Glaciol., 20, 327–335.
Bindschadler, R., Scambos, T., Rott, H., Skvarca, P. and Vornberger, P.. 2002. Ice dolines on Larsen Ice Shelf, Antarctica. Ann. Glaciol., 34 (see paper in this volume).
Budd, W.F. 1970. Ice flow over bedrock perturbations. J.Glaciol., 9(55), 29–48.
Dozier, J., Schneider, S.R. and McGinnis, D.F. Jr., 1981. Effect of grain-size and snowpack water equivalence on visible and near-infrared satellite observations of snow. Water Res. Res., 17(4), 1213–1221.
Escher, J.C. and Pulvertaft, T.C.R.. 1995. Geological map of Greenland. (Scale 1:2500 000.) Copenhagen, Geological Survey of Greenland.
Fastook, J.L., Brecher, H.H. and Hughes, T.J.. 1995. Derived bedrock elevations, strain rates and stresses from measured surface elevations and velocities: Jakobshavns Isbræ, Greenland. J. Glaciol., 41(137), 161–173.
Hamilton, G., Arcone, S., Yankielun, N. and Mayewski, P.. 2000. Spatial variation in snow accumulation rates investigated using ground penetrating radar and GPS. [Abstract.] Eos, 81(19), Spring Meeting Supplement, S21.
Joughin, I., Fahnestock, M., Ekholm, S. and Kwok, R.. 1997. Balance velocities of the Greenland ice sheet. Geophys. Res. Lett., 24(23), 3045–3048.
Joughin, I. and 7 others. 1999. Tributaries of West Antarctic ice streams revealed by RADARSAT interferometry. Science, 286(5438), 283–286.
Krabill, W.B., Thomas, R.H., Martin, C.F., Swift, R.N. and Frederick, E.B.. 1995. Accuracy of airborne laser altimetry over the Greenland ice sheet. Int. J. Remote Sensing, 16(7), 1211–1222.
Nolin, A.W. and Liang, S.. 2000. Progress in bidirectional reflectance modeling and applications for surface particulate media: snow and soils. Remote Sensing Rev., 18, 307–342.
Reichenbach, S.E., Koehler, D.E. and Strelow, D.W.. 1995. Restoration and reconstruction of AVHRR images. IEEE Trans. Geosci. Remote Sensing, GE-33(4), 997–1007.
Scambos, T.A. and Fahnestock, M.A.. 1998. Improving digital elevation models over ice sheets using AVHRR-based photoclinometry. J.Glaciol., 44(146), 97–103.
Scambos, T.A., Dutkiewicz, M.J., Wilson, J.C. and Bindschadler, R.A.. 1992. Application of image cross-correlation to the measurement of glacier velocity using satellite image data. Remote Sensing Environ., 42(3), 177–186.
Scambos, T.A., Kvaran, G. and Fahnestock, M.A.. 1999. Improving AVHRR resolution through data cumulation for mapping polar ice sheets. Remote Sensing Environ., 69(1), 56–66.
Van derVeen, C.J., Mosley-Thompson, E., Gow, A. and Mark, B.G.. 1999. Accumulation at South Pole: comparison of two 900-year records. J. Geophys. Res., 104(D24), 31, 067–31, 076.
Whillans, I.M. and Johnsen, S.J.. 1983. Longitudinal variations in glacial flow: theory and test using data from the Byrd Station strain network, Antarctica. J. Glaciol., 29(101), 78–97.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed