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Monitoring of wet snow and accumulations at high alpine glaciers using radar technologies

Wendleder, Anna and Heilig, Achim and Schmitt, Andreas and Mayer, Christoph (2015) Monitoring of wet snow and accumulations at high alpine glaciers using radar technologies. In: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, pp. 1063-1068. 36th International Symposium on Remote Sensing of Environment, 2015-05-11 - 2015-05-15, Berlin, Deutschland. doi: 10.5194/isprsarchives-XL-7-W3-1063-2015. ISSN 1682-1750.

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Official URL: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1063/2015/isprsarchives-XL-7-W3-1063-2015.pdf

Abstract

Conventional studies to assess the annual mass balance for glaciers rely on single point observations in combination with model and interpolation approaches. Just recently, airborne and spaceborne data is used to support such mass balance determinations. Here, we present an approach to map temporal changes of the snow cover in glaciated regions of Tyrol, Austria, using SAR-based satellite data. Two dual-polarized SAR images are acquired on 22 and 24 September 2014. As X and C-band reveal different backscattering properties of snow, both TerraSAR-X and RADARSAT-2 images are analysed and compared to ground truth data. Through application of filter functions and processing steps containing a Kennaugh decomposition, ortho-rectification, radiometric enhancement and normalization, we were able to distinguish between dry and wet parts of the snow surface. The analyses reveal that the wet-snow can be unambiguously classified by applying a threshold of -11 dB. Bare ice at the surface or a dry snowpack does not appear in radar data with such low backscatter values. From the temporal shift of wet-snow, a discrimination of accumulation areas on glaciers is possible for specific observation dates. Such data can reveal a periodic monitoring of glaciers with high spatial coverage independent from weather or glacier conditions.

Item URL in elib:https://elib.dlr.de/100506/
Document Type:Conference or Workshop Item (Speech)
Title:Monitoring of wet snow and accumulations at high alpine glaciers using radar technologies
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wendleder, AnnaUNSPECIFIEDhttps://orcid.org/0009-0005-1534-4732UNSPECIFIED
Heilig, AchimUniversity of HeidelbergUNSPECIFIEDUNSPECIFIED
Schmitt, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mayer, ChristophBavarian Adademie of Sciences and HumanitiesUNSPECIFIEDUNSPECIFIED
Date:May 2015
Journal or Publication Title:International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.5194/isprsarchives-XL-7-W3-1063-2015
Page Range:pp. 1063-1068
ISSN:1682-1750
Status:Published
Keywords:SAR, polarimetry, backscattering, classification, snow, snow mapping
Event Title:36th International Symposium on Remote Sensing of Environment
Event Location:Berlin, Deutschland
Event Type:international Conference
Event Start Date:11 May 2015
Event End Date:15 May 2015
Organizer:DLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Fernerkundung der Landoberfläche (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Wendleder, Anna
Deposited On:16 Dec 2015 13:26
Last Modified:24 Apr 2024 20:05

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