Assessing the debris around glaciers using remote sensing and random sets

Mus Bandishoev, Arta Dilo, A. Stein

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Abstract

Glacier mapping from satellite multispectral image data is hampered by debris cover on glacier surfaces. Information on the spatial distribution and spatial-temporal dynamics of debris, however, bears various kinds of uncertainties. Debris exhibits the same spectral properties as lateral and terminal moraines and as bedrock outside the glacier margin. Multispectral classification alone is thus not suitable to properly assess its extent. Additional information has to be included, like the low slope angles and curvature characteristics. In this research we propose a random set method for uncertainty modelling of debris-covered glaciers extracted from remote sensed data. Here, we analyse the Fedchenko glacier situated in the Pamir mountains in Central Asia. Clean glacier ice and debris area are represented by random sets. Their statistical mean and median are estimated. The paper combines the advantages of an automated multispectral classification for clean glacier ice and snow with slope information derived from the digital elevation model (DEM). We use an SRTM3 DEM that is resampled to 30m. From a 1999 Landsat ETM+ image the results show that the mean area of clean glacier ice equals 841.87 km2, and 94.39 km2 for debris-covered area. Temporal analysis shows that the mean area of clean ice increased from 1992 to 1999 and is decreasing since 1999, in opposite to the debris covered area. We conclude that this method based on random set theory has the potential to serve as a general framework in uncertainty modelling of debris-covered glaciers and is applicable for mountainous glaciers.
Original languageEnglish
Title of host publicationProceedings of the 7th International Symposium on Spatial Data Quality, ISSDQ'11
EditorsC.C. Fonte, L.M.S. Goncalves, G. Goncalves
Place of PublicationCoimbra, Portugal
PublisherInstituto de Engenharia de Sistemas e Computadores de Coimbra (INESC Coimbra)
Pages27-32
Number of pages6
ISBN (Print)978-989-95055-8-2
Publication statusPublished - 12 Oct 2011
Event7th International Symposium on Spatial Data Quality, ISSDQ'11, Coimbra, Portugal - Coimbra, Portugal, Coimbra, Portugal
Duration: 12 Oct 201114 Oct 2011
Conference number: 7
http://www.mat.uc.pt/issdq2011/

Publication series

Name
PublisherInstituto de Engenharia de Sistemas e Computadores de Coimbra (INESC Coimbra)

Conference

Conference7th International Symposium on Spatial Data Quality, ISSDQ'11, Coimbra, Portugal
Abbreviated titleISSDQ 2011
CountryPortugal
CityCoimbra
Period12/10/1114/10/11
Internet address

Keywords

  • METIS-285206
  • Glacier mapping
  • Debris cover
  • EWI-20792
  • IR-78730
  • Random set theory
  • Uncertainty modelling
  • DEM analysis

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