GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 1/16 Regional quantification of rock glacier movement in Austria using governmental.

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Presentation transcript:

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 1/16 Regional quantification of rock glacier movement in Austria using governmental GIS data V. Kaufmann Institute of Geodesy Working Group Remote Sensing and Photogrammetry Graz University of Technology, Austria A. Kellerer-Pirklbauer Department of Geography and Regional Science University of Graz, Austria

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 2/16 1. Introduction  Kinematics of rock glaciers  Application of geobrowsers (Google Maps, Microsoft Bing) for detection and quantification of fast moving rock glaciers  Study area: Schober Mountains (Hohe Tauern Range, Austria) Regional quantification of rock glacier movement in Austria using governmental GIS data Hohe Tauern Range Schober Mountains

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 3/16 Regional quantification of rock glacier movement in Austria using governmental GIS data Study area: 125 km 2

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 4/16 Regional quantification of rock glacier movement in Austria using governmental GIS data

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 5/16 Regional quantification of rock glacier movement in Austria using governmental GIS data

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 6/16 2. Multi-temporal digital orthophotos Regional quantification of rock glacier movement in Austria using governmental GIS data Date Original GSD (cm) Spectral bandsType of camera Sept. 18, RGBAnalog Sept. 7, RGBAnalog Aug. 25, RGB NIRDigital GIS data providers: Regional government of Tyrol (TIRIS – Regional government of Carinthia ( KAGIS –

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 7/16 3. Visual detection of surface change Regional quantification of rock glacier movement in Austria using governmental GIS data Animated GIF: 2002 – 2009 – 2012 Tschadinhorn rock glacier 50 m

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 8/16 3. Visual detection of surface change Regional quantification of rock glacier movement in Austria using governmental GIS data Snout of Tschadinhorn rock glacier August 1, 2014

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 9/16 4. Computation of displacement vectors and flow velocity Regional quantification of rock glacier movement in Austria using governmental GIS data  Matlab-based program  Change detection (multi-temporal orthophotos and DEMs)  Image matching (NCC, back-matching)  Sub-pixel accuracy  Automatic detection of outliers  Stable areas: detection of small systematic offsets, accuracy assessment

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 10/16 5. Results  Two thematic maps ( , ) showing the mean annual horizontal flow velocity of all rock glaciers of the study area  12 intact rock glaciers revealed significant movements in both periods.  V max = 440 cm/a  Velocity increase by a factor of 1.4 to 1.8 Regional quantification of rock glacier movement in Austria using governmental GIS data

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 11/16 Regional quantification of rock glacier movement in Austria using governmental GIS data GSD = 50 cm

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 12/16 Regional quantification of rock glacier movement in Austria using governmental GIS data Tschadinhorn rock glacierGSD = 20 cm

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 13/16 Regional quantification of rock glacier movement in Austria using governmental GIS data Tschadinhorn rock glacier max. flow velocity = 117 cm/a max. flow velocity = 177 cm/a

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 14/16 6. Conclusions  Data availability and accuracy –Multi-temporal orthophotos (3-year interval) are available. –Geometric quality of orthophotos is generally high. –Relative registration error of ±60 cm for any two orthophotos, thus –3-year interval: accuracy is approx. ±20 cm/a; –The detection of slow moving rock glaciers is not possible. –Ortho-rectification quality is mainly influenced by DEM. –The current availability of multi-temporal governmental DEMs is limited. –DEMs offer great potential in change detection. Regional quantification of rock glacier movement in Austria using governmental GIS data

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 15/16 6. Conclusions  Rock glacier speed-up and climate relationship –Almost all fast moving rock glaciers in the study area have increased their mean annual flow velocities. –This regional signal is also confirmed on an Alpine-wide scale. –Warmer temperatures favor higher velocities. Regional quantification of rock glacier movement in Austria using governmental GIS data

GEOMORPHOMETRY 2015, Poznań, Poland Kaufmann & Kellerer-Pirklbauer 16/16 For further information, please contact: Viktor Kaufmann Institute of Geodesy Working Group Remote Sensing and Photogrammetry Graz University of Technology Steyrergasse 30 A-8010 Graz, Austria Regional quantification of rock glacier movement in Austria using governmental GIS data