An Application of Interferometric Synthetic Aperture Radar in a Railroad Corridor El Hachemi Bouali, Thomas Oommen, Rüdiger Escobar-Wolf, Samuel Douglas, Vicky Hsiao, Adrian Bohane 14 th Annual Technical Forum for Geohazards Impacting Transportation in the Appalachian Region Geohazards Session 4: Geophysical, Geotechnical Techniques & Instrumentation (August 6, 2014) DISCLAIMER: The views, opinions, findings, and conclusions reflected in this presentation are the responsibility of the authors only and do not represent the official policy or position of the USDOT/OST-R, or any State or other entity.
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An Application of Interferometric Synthetic Aperture Radar in a Railroad Corridor
El Hachemi Bouali, Thomas Oommen, Rüdiger Escobar-Wolf, Samuel Douglas,
Vicky Hsiao, Adrian Bohane
14th Annual Technical Forum for Geohazards Impacting Transportation in the Appalachian Region Geohazards Session 4: Geophysical, Geotechnical Techniques & Instrumentation (August 6, 2014)
DISCLAIMER: The views, opinions, findings, and conclusions reflected in this presentation are the responsibility of the authors only and do not represent the official policy or position of the USDOT/OST-R, or any State or other entity.
Discussion Outline
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I. Introduction to project goal
II. Interferometric Synthetic Aperture Radar (InSAR)
III. Railroad Corridor Setting Local Geology History of Slope Movements Observed in the Field
IV. InSAR Data & Results Two Pass Interferometry Persistent Scatterer Interferometry SqueeSAR™
V. Conclusions
Project Goal
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Establish a economically sustainable framework for managing geotechnical assets using remote sensing along the transportation corridor.
What are Geotechnical Assets?
4 Image source: Vessely (2013)
Performance and safety of the transportation infrastructure throughout the life-cycle depends upon the geotechnical asset that
is adjacent to it or that supports it.
Geotechnical Assets
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Proposed Geotechnical Asset Taxonomy (Anderson and Schaefer, 2014)
This study will focus on the independent features
Transportation Asset Management
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Introduction to InSAR
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Synthetic Aperture Radar: A coherent, mostly airborne or spaceborne, side-looking radar system. It utilizes the flight path of an attached platform to create a synthetic aperture, or ‘fake antenna.’ Interferometric SAR: The use of multiple acquired SAR images as a method for change detection measurement.
December 19, 2004 – January 23, 2005 January 23, 2005 – February 27, 2005 February 27, 2005 – April 3, 2005 April 3, 2005 – May 8, 2005 May 8, 2005 – June 12, 2005 June 12, 2005 – July 17, 2005 July 17, 2005 – August 21, 2005 August 21, 2005 – September 25, 2005
1 kilometer
Red = 1 Blue = 0
October 10, 2004 – December 19, 2004
InSAR Results: Two Pass
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Line of Sight (LOS) Displacement
N
1 kilometer
December 19, 2004 – January 23, 2005 January 23, 2005 – February 27, 2005 February 27, 2005 – April 3, 2005 April 3, 2005 – May 8, 2005 May 8, 2005 – June 12, 2005 June 12, 2005 – July 17, 2005 July 17, 2005 – August 21, 2005 August 21, 2005 – September 25, 2005
Covers large area Data generally free (with written proposal)
Requires less time than separate field excursions Wealth of historical data (1992-present, depending on satellite)
Limitations of techniques Range of displacement rates (order of magnitude) Point locations unknown prior to processing
Different techniques yield different point locations Complex topography = paucity of points Velocities limited to LOS direction
Acknowledgements
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• USDOT- Office of the Assistant Secretary for Research and Technology Program Manager: Caesar Singh Cooperative Agreement #RITARS-14-H-MTU Project: Sustainable Geotechnical Asset Management
along the Transportation Infrastructure Environment Using Remote Sensing
Data provided by the European Space Agency DEM provided by the Jet Propulsion Laboratory at