Map Module>Contours>Grids>Sample Grids to Seismic...
The sample grid to seismic option can back interpolate z values from a contour grid onto seismic shot point locations.
Grid File To Sample
This section contains a list of the current grid files in the project. Choose the grid to sample onto the seismic locations. Use the "Grid Info" button to view the grid details or to check grid statistics.
Sample To Seismic Z Variable
This section defines the seismic Z data item which will receive the interpolated values from the grid. Select one of the defined seismic Z data items or type in a new Z name. If you enter a new name, you will be prompted for the Z data description, units, and remarks.
The "Sample to Active lines only" option can be used to restrict the grid sampling to only the seismic lines which are currently in the active state. Turn this option off if you want to sample the grid to all seismic lines and shot points.
Turn on the "Only Sample to Null Z Values" option if you do not want to overwrite valid values with the interpolated grid values. Only seismic Z values containing a Null value will be replaced.
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