Butterworth Filter for Anomaly Profile

Use the Butterworth filter to apply a Fast-Fourier Transform Butterworth filter to the anomaly profiles.

Butterworth Filter dialog options

Central Wavelength cutoff

Specify the central wavelength cutoff value..

Degree of Filter

Specify the degree of the filter function.

Low or High-Pass Filter

Select Low or High-Pass filter (default = Low).

Application Notes

  • Ground units are the distance units defined for the model origin and projection.

    • The Butterworth filter is excellent for applying straight forward High-Pass and Low-Pass filters to data because you can easily control the degree of filter roll-off while leaving the central wavelength fixed. If ringing is observed, the degree can be reduced until acceptable. A common, but more complicated alternative is the Cosine filter.

    See Also:

    For additional technical information you can view the Oasis montaj 1D-FFT Butterworth database channel filter help topic, by searching for the following in the Oasis montaj Help:

    • FFTBUTTW GX (Butterworth filter)