An Elaborately Designed Virtual Frame to Level Aeromagnetic Data

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