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The 2D data were used called Benjamin Creek data (.also called the Husky Canadian Foothills data) was shot in the foothills of the Canadian Rockies. Husky Oil and Talisman Energy who have released it for aiding general industry technological development own the data set. There are a total of 39,763 traces comprising 141 shots of approximately 300 traces or less in each shot. The sample rate is 4 milliseconds and there are 3 seconds of data. The surface has considerable topography (elevations) and the structure while complex is predominantly 2D. Two-dimensional Fourier transform over time and space is called an F-K (or K-F) transform where F is the frequency (Fourier transform over time) and K refers to wave number (Fourier transform over space). The space dimension is controlled by the trace spacing and (just like when sampling a time series) must be sampled according to the Nyquist criterion to avoid spatial aliasing. F-K domain there is a two-dimensional amplitude and phase spectrum but usually only the former is displayed for clarity with color intensity used to show the amplitudes of the data at different frequency and wave-number components. Several noise types such as ground roll or seismic interference may be more readily separated in the FK amplitude domain than the time-space domain and therefore will be easier to mute before the inverse transform is applied. Spatial aliasing is a common problem to be considered when performing data processing. One way to limit the spatial aliasing of the previous figure would be to remove frequencies above 30Hz. This would be wasteful of primary signal. The trace spacing is also important. Consider the adjacent
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