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An Elaborately Designed Virtual Frame to Level Aeromagnetic Data | IEEE Journals & Magazine | IEEE Xplore

An Elaborately Designed Virtual Frame to Level Aeromagnetic Data


Abstract:

Aeromagnetic data are usually contaminated by line-to-line errors, which are most often visible as stripe patterns in a 2-D data map. Leveling is a critical step to elimi...Show More

Abstract:

Aeromagnetic data are usually contaminated by line-to-line errors, which are most often visible as stripe patterns in a 2-D data map. Leveling is a critical step to eliminate these errors in data processing and interpretation. The conventional tie-line leveling technique involves control lines (tie lines) which are perpendicular to flight lines to extract the leveling errors. By contrast, there are also some other methods to level without the need for tie lines, which can save considerable survey cost. However, a main setback when leveling without tie lines is to distinguish the cross-line gradients from the leveling errors, making the leveled results inferior. In this letter, we revisit tie-line leveling as a nonlinear spatial-filtering technique and analyze the inadequacy of it, based on which a new approach is developed to extract the leveling errors without additional tie lines. The approach includes two steps: designing a virtual frame and leveling based on this frame. The virtual frame is elaborately designed to ensure that each extracted point can represent the local field-intensity level of a flight line and each virtual cross line can bypass the localized areas of magnetic anomalies; hence, some difficulties when leveling without tie lines are overcome. Afterward, two real field data examples are tested to demonstrate the effectiveness of this approach.
Published in: IEEE Geoscience and Remote Sensing Letters ( Volume: 13, Issue: 8, August 2016)
Page(s): 1153 - 1157
Date of Publication: 16 June 2016

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