Using the GridFFT tool (interactive only)

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Interactive

_To use GridFFT with the INTREPID graphic user interface_

Choose GridFFT from the Filter menu of the Project Manager or use the command gfilt.exe. INTREPID displays the GridFFT window.
If you have a task specification file, load it using Load Options from the File menu. (See Specifying Input and Output (Filtered) Datasets below for detailed instructions.) If all of the specifications are correct in this file, go to step 8. If you wish to modify any settings, carry out the following steps as required.
Specify the input grid dataset to be filtered. Use one of the methods in Specifying Input and Output (Filtered) Datasets.
If the input data is in the spatial domain (not already FFT-transformed):
- If you want to save a copy of the FFT-transformed grid for future use to save processing time, specify this and the dataset name for this grid. See Saving FFT of input grid dataset below for detailed instructions.
- Use Pre FFT Grid Conditioning properties to specify the parameters for the transformation (See Pre FFT Grid Conditioning for detailed instructions.)
Select the filters to be used in the process from the Available filters list. For each filter, set its parameters. See GridFFT filters overview and [INTREPID spectral domain operations reference (R14)].
Use Post-FFT Grid Restoration properties to set parameters for the post-filter reverse FFT transformation (See Post-filter transformation options below for detailed instructions.)
Specify the output grid dataset for the results of the filtering. Use one of the methods in Specifying Input and Output (Filtered) Datasets.
Choose Apply. INTREPID performs the filter process, saves the output dataset and displays the results graphically in the Data display tabs.
Examine the graphical display of the filter process and results in the Data display tabs. (See Data display tabs below for information).
If you wish to record the specifications for this process in a .job file, so that you can perform a similar task later, use Save Options from the File menu. (See Specifying Input and Output (Filtered) Datasets below for detailed instructions.)
If you wish to repeat the process, repeat steps 2-10, varying the parameters and data files as required.
To exit from GridFFT, choose Quit from the File menu.

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After using GridFFT you can carry out a more detailed inspection of the filtered grid using an INTREPID visualisation tool. See [Visualisation (T26):Home]

You can choose options from the Help menu (See Help (interactive only) below).

You can execute GridFFT as a batch task using a task specification (.job) file that you have previously prepared. See Using task specification files below for details.