The mis-tie cross-points table is a line-intersection misfit table that records, for every point where two 2D seismic lines cross, the measured time misfit together with the time shift and phase rotation to apply to each line. g-Space can import this table from a tab-separated ASCII .txt file so a previously computed or edited set of intersection corrections can be reloaded into the project.

Purpose

Importing the cross-points table restores the state of 2D seismic mis-tie correction: the per-intersection time misfits, the time shifts and phase rotations for each line, and the checked (QC) flag. The imported values feed the mis-tie correction so the shifts and rotations can be reviewed, redistributed, or applied to the data without recomputing every intersection.

Requirements

The 2D lines referenced in the file must already be loaded, because each row is matched to an existing intersection in the project. Rows are located by their X and Y coordinates to the nearest intersection; if no intersection lies close enough, or if the named lines do not pass through that point, the row is skipped.

Launching the import

Run the mis-tie correction on your 2D seismic lines, then use the Import cross-points table command. A standard file dialog opens filtered to Text files (*.txt).

[image: placeholder_The_mis-tie_correction_with_the_Import_c.png]

Step-by-step

1. Make sure the 2D seismic lines are loaded and their intersections are available in the mis-tie correction.
2. Invoke Import cross-points table and select the .txt file to load.
3. g-Space reads the file, skips the header row, and matches each data row to the nearest existing line intersection.
4. For every matched intersection the time shifts, phase rotations, time misfit, and checked flag are applied; the lines are re-ordered automatically if the file lists them in the opposite order.
5. Review the updated intersection misfits and shifts; unmatched rows are reported as warnings and left out.

[image: placeholder_Intersection_misfits_and_shifts_updated_.png]

File format

The file is tab-separated ASCII with a single header line followed by one row per intersection. Each row has ten columns:

• X, Y - coordinates of the line-intersection point (used to match the row to an existing intersection).
• Checked - QC flag, Y or N.
• Misfit - measured time misfit at the intersection.
• Line1, Line2 - names of the two intersecting 2D lines.
• Shift1, Shift2 - time shifts applied to each line.
• Rotation1, Rotation2 - phase rotations (in degrees) applied to each line.

A row is ignored unless it has exactly these ten tab-separated columns, so keep the layout produced by the export intact.

See Also

Export mistie cross-points | Seismic Data Formats