Interpolate
Use the Database Tools > Channel Tools > Interpolate menu option (geogxnet.dll(Geosoft.GX.Database.InterpolateChannel;Run)*) to replace dummies in a channel, while honouring a minimum gap.
The option is also available with the Geophysics Levelling extension under the Tie Line Levelling > Interpolate menu.
Interpolate dialog options
Application Notes
*The GX tool will search in the "...\Geosoft\Desktop Applications \gx" folder. The GX.Net tools, however, are embedded in the geogxnet.dll located in the "...\Geosoft\Desktop Applications \bin" folder. If running this GX interactively, bypassing the menu, first change the folder to point to the "bin" folder, then supply the GX.Net tool in the specified format.
Both 'Minimum curvature' and Akima interpolation methods define a second-order cubic spline to interpolate dummy values. 'Minimum curvature' produces the smoothest possible interpolation, but may create undesirable over-shoot in some areas, while Akima interpolation tends to be less smooth, but does not suffer from unreasonable over-shoot. 'Prediction' uses a maximum entropy prediction algorithm to predict the missing values such that they will have noise characteristics similar to the original data; when choosing this option, you can force the two ends of each line to be continuous and maintain periodicity. This is specifically needed for applying FFT filters. 'Linear' is a standard straight-line technique, and 'Nearest' assigns the value of the nearest non-dummy point.
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