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Update bins topography reads the elevation values recorded at each source and receiver point in the geometry and interpolates those values onto every bin centroid in the survey. This ensures that each bin carries an accurate surface elevation, which is required for elevation statics corrections and depth-domain processing.
The module performs inverse-distance interpolation using the five nearest source or receiver elevation control points to estimate each bin elevation. After interpolation the resulting elevation field is spatially smoothed over a user-defined distance to reduce short-wavelength noise. For 2-D surveys, cumulative picket distances along the line are also recomputed so that source and receiver positions are correctly projected onto the stack line. The module outputs both the smoothed trace headers (main output) and an unsmoothed copy for comparison.
Use this module after loading geometry and before running elevation or refraction statics. It is suitable for both 2-D and 3-D land surveys.
The seismic data gather or dataset whose geometry will be updated. This connection provides access to the full geometry object, including the source and receiver point coordinates and elevations used to derive the bin topography.
The geometry (trace vector) object containing the survey bin grid, source points, and receiver points with their X, Y, and Z coordinates. The elevation values stored at source and receiver locations in this object are the primary input for the interpolation step.
Enable this option when processing a 3-D survey. When set to true, the module skips the 2-D picket-distance recalculation and does not project sources and receivers onto a single stack line. Leave this option disabled (default) for 2-D line geometry, where picket distances along the line must be recomputed after the elevation update.
The lateral radius (in metres) over which the interpolated bin elevations are averaged to produce a smoothed topography surface. The default value is 500 m. All bins within this distance of a given bin are included in the running average for that bin.
Increase this value in areas with rugged topography where high-frequency elevation variations would introduce unrealistic rapid statics variations. Decrease it when the terrain changes gradually over short distances and you wish to preserve fine topographic detail in the datum. Setting this value to 0 disables smoothing, so the raw interpolated elevations are passed directly to the output.