Gaussian Regional/Residual (GAUS)

Use the Gaussian Regional/Residual option to apply a Gaussian regional/residual filter.

Gaussian Regional/Residual Filter dialog options

Cutoff wavelength	The cutoff wavelength k0-1 is the central wavelength of the regional residual Gaussian filter. Note that the function amplitude at this point is only 0.39.
Low pass (regional) High pass (residual)	Select if on output, the regional (default) or residual component is desired.

Application Notes

The Gaussian filter is a smooth filter that is often used for low-pass or high-pass applications.

Gaussian regional/residual filter

Where:

k0	The cutoff central wavelength of the roll-off.

Wavenumber domain variable definition

k	Wavenumber domain increment, used to depict a radially symmetrical variable.	where: np is the number of points cs is the cell size
u	X component in the wavenumber domain.	k = 2π ( i μ+j ν )
v	Y component in the wavenumber domain.
r	Radial component in the wavenumber domain.	also 2πk
θ	Polar component in the wavenumber domain.

Ground_unit is the survey ground units as defined in your grid (e.g. metre or feet). Ground units may be left undefined.