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Proceedings Paper

Topographic migration of georadar data
Author(s): Frank Lehmann; Alan G. Green
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Paper Abstract

Application of conventional elevation static corrections and migration to wavefield data recorded on irregular surfaces may result in poor reconstructions of complex subsurface features. Particularly poor images may be obtained at locations where the depths to target structures are comparable to undulations in the surface topography. For example, topographic relief of only 1 - 2 m may be important for the processing of georadar data. We describe an approach that allows georadar data to be migrated directly from gently to highly irregular acquisition surfaces. When applied complicated synthetic data sets, topographically migrated images are observed to be markedly superior to those produced by two standard processing schemes. Extensive tests demonstrate that topographic migration should be considered in regions characterized by surface gradients greater than 10% (i.e., dips greater than 6 degrees). For effective topographic migration, lateral and vertical coordinates of the georadar antennas should be determined to better than 10% of the dominant georadar wavelength and velocities should be known to within 10 - 20% (e.g., 0.01 - 0.02 m/ns) of their true values.

Paper Details

Date Published: 27 April 2000
PDF: 5 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383556
Show Author Affiliations
Frank Lehmann, Swiss Federal Institute of Technology/Zurich (Switzerland)
Alan G. Green, Swiss Federal Institute of Technology/Zurich (Switzerland)

Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

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