High-pass (HPAS)

Use the High-pass option to apply a high-pass filter to the data.

Cutoff wavelength

The cutoff wavelength k₀^-1, in ground units. All wavelengths longer than this value are removed.

A high-pass filter removes long-wavelength components while retaining shorter wavelengths.

The filter response is defined as:

L(k) = 0	for k < k₀
L(k) = 1	for k ≥ k₀

Where:

k = wavenumber

k₀ = cutoff wavenumber

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The following variables are used in the wavenumber domain:
k	Wavenumber increment, used to depict a radially symmetrical variable.	Where: np: number of points cs: cell size
μ	X-component of the wavenumber.
v	Y-component of the wavenumber.
r	Radial component of the wavenumber.
θ	Angular (polar) component of the wavenumber.

Ground unit refers to the survey ground units defined in your grid (e.g., metres or feet). Ground units may be left undefined.