NaN, or "not a number", is a common acronym used to represent values that are undefined. In seismic data and other volumes, NaN values are used to represent non-existent data or missing values. Some processes and formulas may generate NaN values when the calculation is invalid.
- Click the Process tab in the Control Panel, add a NaN Removal process and enter an appropriate name. (See Processes Overview for more details on processes in Insight).
- Select a Volume that requires correction.
Select the Action for the removal process. There are three methods:
- Replace with a constant: NaN values will be replaced by the value in the NaN replacement value field. By default, this is set to zero
- Linear Interpolation: The replacement value is interpolated from the two neighbouring non-NaN values.
- Nearest Neighbour: The nearest non-NaN value is used.
- Click the Replace Zeroes Too to apply the same process to zero values.
- The result will be available as a selectable virtual volume in Insight.