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Levelling aeromagnetic survey data without the need for tie‐lines
Author(s) -
White* James C.,
Beamish David
Publication year - 2015
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12198
Subject(s) - levelling , aeromagnetic survey , geology , geodesy , line (geometry) , raw data , field (mathematics) , least squares function approximation , wavenumber , representation (politics) , remote sensing , statistics , mathematics , magnetic field , geometry , optics , physics , quantum mechanics , estimator , pure mathematics , politics , law , political science
A new methodology that levels airborne magnetic data without orthogonal tie‐lines is presented in this study. The technique utilizes the low‐wavenumber content of the flight‐line data to construct a smooth representation of the regional field at a scale appropriate to the line lengths of the survey. Levelling errors are then calculated between the raw flight‐line data and the derived regional field through a least squares approach. Minimizing the magnitude of the error, with a first‐degree error function, results in significant improvements to the unlevelled data. The technique is tested and demonstrated using three recent airborne surveys.