On the errors involved in ice-thickness estimates II: Errors in digital elevation models of ice thickness

J. J. Lapazaran*, J. Otero, A. Martín-Español, F. J. Navarro

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
259 Downloads (Pure)

Abstract

This paper is the second (Paper II) in a set of studies concerning the errors involved in the estimate of ice thickness and ice volume. Here we present a detailed analysis of the errors involved in the generation of ice-thickness DEMs constructed, most often, from GPR data, complemented by boundary data and sometimes, additional synthetic data arising from estimates based on theoretical considerations supported by independent data. We describe a complete methodology of error analysis that, starting from the errors in the data, propagates them to the grid nodes. In turn, the interpolation error at the grid nodes is calculated using a novel procedure that also provides an estimate of the bias introduced by the interpolation process. Finally, both errors are combined at the grid nodes to produce a gridpoint-dependent error estimate, which is complemented by an overall error estimate providing an assessment of the quality of the DEM. This methodology is illustrated with the case study of Werenskioldbreen, a land-terminating polythermal glacier in Svalbard.

Original languageEnglish
Pages (from-to)1021-1029
Number of pages9
JournalJournal of Glaciology
Volume62
Issue number236
DOIs
Publication statusPublished - 1 Dec 2016

Keywords

  • DEM
  • error analysis
  • glacier mapping
  • ground-penetrating radar
  • ice thickness

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