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One traverse line after the other was adjusted by a cubic spline similar as in step four, but this time the cubic spline was fitted to both tie-line cross-over differences as well traverse line cross-over differences.
A fifth step is taking into account traverse line crossover differences from traverse line intersections or repeatedly flown traverse lines, that otherwise pose a problem for gridding, but also give an opportunity to make additional adjustments in the line levelling.
(c): Levelled survey data as well as grid data along the traverse line indicated as black line in (b).
Additionally, some flights included sections from more than one traverse line or parts of traverse lines were flown more than once.
In the LOMGRAV survey some magnetic anomalies have short wavelength compared to the traverse line spacing, leading to artefacts in the interpolated grid data.
Along the whole traverse line, the LOMGRAV grid (purple in Fig. 2(c)) shows more detail and higher resolution than the EMAG2 grid (green) from the same (or slightly lower) altitude.
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Firstly, the flight lines were split into separate traverse lines and tie-lines.
The LOMGRAV survey, like most airborne surveys, includes a large number of parallel, densely spaced traverse lines and a number of tie-lines with larger line spacing flown orthogonal to the traverse lines.
Cross-over differences occur also within traverse lines, e.g. from 360° turns of the aircraft for the gravity survey.
Parameters for a single section converged rapidly as the number of traverse lines increased, although unacceptable variations were in evidence across multiple sections.
Traverse lines that intersect only two tie-lines were DC-shifted by the mean value of the two tie-line cross-over differences.
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