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<< Click to Display Table of Contents >> Navigation: Geometry > Binning 2D By Line |
Binning 2D By Line assigns each seismic trace to a Common Midpoint (CMP) bin along a 2D crooked survey line. The module projects each source and receiver location onto the nearest point along the predefined stack line, computes the midpoint picket position, and groups traces into regularly spaced CMP bins according to the specified bin spacing. The result is a fully binned trace dataset with updated CMP indices, bin coordinates, and fold counts, ready for subsequent 2D processing such as velocity analysis or stacking.
This module is designed for crooked-line 2D surveys where the acquisition path is not perfectly straight. It uses the geometry of the stack line to correctly place midpoints along the actual survey trajectory. An optional topography smoothing parameter allows the elevation values assigned to each bin to be spatially averaged, reducing the effect of surface irregularities on subsequent datum and static corrections.
Note: This module is marked as deprecated. For new projects, consider using the current Binning 2D workflow instead.
The collection of seismic trace headers containing source and receiver coordinate information for the survey. Each trace must have valid X/Y coordinates for both the shot point and the receiver station. These coordinates are used to project each source and receiver onto the stack line and compute the corresponding midpoint picket position. This input is mandatory — the module will not execute if the trace header dataset is empty or invalid.
The crooked-line geometry that defines the 2D survey path. This is the reference line along which all source and receiver locations are projected in order to assign picket (distance-along-line) values. The stack line must contain valid first and last picket markers as well as first and last CMP markers. It is typically produced by a preceding line-creation or geometry-import module. This input is mandatory.
The spacing between adjacent CMP bins along the stack line, measured in meters. This value directly controls the number of bins created and the lateral resolution of the binned dataset. Each trace midpoint is assigned to the nearest bin whose centre falls within one bin-step interval. Smaller values produce more bins and finer spatial resolution but may result in lower fold per bin; larger values reduce bin count and increase fold but decrease spatial resolution.
Default: 50 m. Set this to half the receiver group interval for standard CMP binning, or match the nominal CMP spacing specified in the survey design.
The radius, in meters, used to spatially average the elevation (topography) values assigned to each CMP bin along the stack line. When this value is greater than the bin spacing, the module averages the elevations of all neighbouring bins that fall within the specified radius before storing the result. This smoothing reduces short-wavelength elevation noise, which can otherwise introduce high-frequency artefacts into datum-based static corrections.
Default: 0 m (no smoothing applied). Set this to a value larger than the bin spacing only when the survey area has significant topographic relief and you want to suppress rapid elevation changes from affecting static calculations. A typical value might range from one to several bin spacings depending on the terrain roughness.