Topographic migration of georadar data

Frank Lehmann; Alan G. Green

doi:10.1117/12.383556

27 April 2000 Topographic migration of georadar data

Frank Lehmann, Alan G. Green

Proceedings Volume 4084, Eighth International Conference on Ground Penetrating Radar; (2000) https://doi.org/10.1117/12.383556
Event: 8th International Conference on Ground Penetrating Radar, 2000, Gold Coast, Australia

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.

Citation Download Citation

Frank Lehmann and Alan G. Green "Topographic migration of georadar data", Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); https://doi.org/10.1117/12.383556

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