Bandpass (BPAS)
Use the Bandpass option to apply a bandpass filter.
Bandpass Filter dialog options
Long wavelength cutoff |
The long wavelength cutoff in ground unit. See illustration, this parameter is equivalent to k0-1. |
Short wavelength cutoff |
The short wavelength cutoff in ground unit. See illustration, this parameter is equivalent to k1-1. |
Pass Reject |
Pass or reject the defined band; The default is to pass the band. |
Application Notes
The bandpass filter (BPAS) can be used to pass or reject a range of wavelengths contained in the data. However, applying such a simple cutoff filter operator to an energy spectrum almost invariably introduces a significant amount of oscillation (also known as Gibbs’ Phenomenon). This filter is present for the sake of completeness. We recommend that you use a tapered filter such as the Butterworth filter (BTWR).
Bandpass Filter
Where:
k0 |
Low wavenumber cutoff in cycles/ ground unit. |
k1 |
High wavenumber cutoff in cycles/ground unit. |
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.
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