Re-Fid a Channel

Use the Database Tools > Channel Tools > Re-Fid a Channel menu option (REFID GX) to change the fid sampling of a channel to be based on a reference channel. This is normally done to resample a database based on a distance channel, in which case the new fiducial will be distance.

The option is also available in the Geophysics extension under the 1D FFT > Advanced Settings > Re-Fid Back to Fiducial menu.

Re-Fid a Channel dialog options

Channel to re-fid	Select the data channel to be re-sampled. Script Parameter: REFID.IN
Resampled output channel	New re-sampled out-put channel. Script Parameter: REFID.OUT
Fid reference channel	Select the Fiducial reference channel. Script Parameter: REFID.REF
New start fiducial	The required new start fiducial. Leave blank to use the default which will be the smallest value in the reference channel. Script Parameter: REFID.START
New fiducial increment	The required new data increment. Leave blank to use the default, which will be the nominal data increment of the the reference channel. Script Parameter: REFID.INCR
Maximum gap to interpolate	The gaps in the data larger than this will not be interpolated. The default is 1.5 times the data increment. Script Parameter: REFID.GAP
Interpolation method	The interpolation method to use, one of "Linear", "Minimum Curvature", "Akima" or "Nearest". Script Parameter: REFID.METHOD

Application Notes

For example, if you wish to work with a data channel using evenly sampled ground units, create a distance channel using the DISTCHAN GX, then resample the X, Y and data channels to the data increment that you require. The X, Y and data fiducials now represent ground distance units.

If you refid a channel, the channel can be resampled in relation to other channels and/or the original fiducial. The system places a red line underneath the channel name to indicate this.