Spectral domain (FFT) grid filters (G16)
Contents
1. E 7 a E El Intrepid_Grid Filter e o ee a File Help H L R x1 x1000 Nyquist 0 00625 cy P Fundamental 0 00003165 cy Available FFT Filters Filtering Process Output Grid Dataset Low Pass Input Grid Dataset 2 Filtered Grid File High Pass Pre FFT Grid Conditioning C V4 5 sample_data cookbooks tensors Aurizonia A_2_GRIDS aurizonia_BG_200_tensor_mitre_FILT ers Band Pass Filter 1 FullTensorIntegration Query Data Format Butterworth _ Post FFT Grid Restoration IEEE4ByteReal Directional Cosine Output Grid Dataset Reduction Continuation Spatial View Spectral Image View Radial Power Spectrum Before Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 2 Library Help Top Overview lt 4 Back gt GridF FT operates in the Fourier domain transforming your grid dataset using a Fast Fourier Transform FFT and enables you to e Enhance grid datasets using a range of available FFT filters e Process extremely large grid datasets e Gain an insight into the filtering process by observing the graphical feedback e Process full tensor amp FALCON grid datasets Spectral Domain Grid Filters generally separate local phenomena from those characteristic of the region as a whole This guided tour demonstrates some standard INTREPID Spectral Domain grid filters You can use the INTREPID Visualisation T2. Mouse Mode C Que C Zoom or Trace Before vertical derivative filter mlevel_ grid Using a Directional Cosine filter a ri Intrepid Visualisation Zoom In Zoom Previous Mouse Mode Zoom or Trace You can specify the input output and parameters for the Directional Cosine filter process in this section of the guided tour using the job file ch14_2 job If you wish JOB load it into the Spectral Domain Grid Filters tool as described in Section Task specification job file short cuts in INTREPID Guided Tours Introduction G01 then go to Step 11 Specify a new 9 Clear the current filter and specify a Directional Cosine filter output dataset Library Help Top In the Filtering Process panel highlight the current filter Remove the filter from the Filtering Process panel by clicking on the lt button From the list of Available FFT Filters on the left hand side highlight Directional Cosine Add the filter to the filtering process by clicking on the upper gt button The filter name appears in the box labelled Filtering Process In the right hand side panel INTREPID displays the Directional Cosine Properties Specify an Azimuth of 135 an Azmiuthal Half Width of 60 degrees and a Cosine Rolloff Degree of 2 Select the Pass option button You can vary the 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 8 Library Help Top 4 Back
3. Phase l i i l Viewing the Radial Power Spectrum Graph 6 View the Radial Power Spectrum graph By choosing Radial Power Spectrum you can observe the Log Power versus Wavenumber or Wavelength distributions for the input and output datasets There are options to access this same data in a csv file and to also pass a moving window around your grid over each anomaly so that individual bodies can be tested a PPI Intrepid_Grid_Filter File Help Ey B AXI a ne Nyquist 0 00625 cydes m Fundamental 0 00008333 cydes m Available FFT Filters Filtering Process Input Grid Dataset Low Pass ip Input Grid Dataset a Input Grid C Intrepid V4 5 sample_data guided_tours ntrepid_datasets mlevel_grid ers wae High Pass E Pre FFT Grid Conditioning Band Pass F Filter 1 Vertical Derivative F Save FFT of Input Grid Horizontal Derivative lt Post FFT Grid Restoration Reduction Output Grid Dataset Input Band No 1 Continuation Analytic Signal IGRF IGRF Total Horizontal Derivative lt Spatial view Spectral Image View Radial Power Spectrum 12 10 oo Radial Power Spectrum 8 o o 6 40 4 aal o 2 nonong Do 200p Op Op o 70090 So 0n q o oo 2 282000000 amp B00000090 Fanon filtered s o aie Filtered 6 p00 o 0o90 REEI ceo 00 0 Gn _oo oon 8 0o00o0000ppo00000pp oo20p00p0 po2200 0 001 0 002 0 003 Wavenumber in cycl
4. gt angular extent dramatically and get very different filter responses with this factor Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 9 Library Help Top 4 Back gt Select the 10 Specify dircos_grid1 as the new output dataset eerie In the panel labelled Filtering Process highlight the Output Grid Dataset entry and Ger The display parameters in the right hand panel will change to reflect your choice parameters Click the small box to the right of the name A Save As dialog box will appear Type in the name dircos_grid1 and click Save As The Filtered Grid Name will be updated to reflect your choice Apply the filter 11 Apply the filter and observe the process in the Grid Filter window mp ee Choose Apply in the Grid Filter window INTREPID will apply the filter save the output dataset and display a Spatial View representation of the filter process in the window e Pl Intrepid_Grid_Filter Nyquist 0 00625 cydes m So Fundamental 0 00008333 cycles m Available FFT Filters Filtering Process Directional Cosine Properties Vertical Derivative A ii Input Grid Dataset 7 Azimuth 135 0 Reduction Pre FFT Grid Conditioning Continuation Azimuthal Half Width 60 0 Analytic Signal Post FFT Grid Restoration a Total Horizontal Derivative Output Grid Dataset say tee cd Pass Pseudo Gravity Matched Filter a Reject
5. by Bell Geoscience 2 From the Filter Panel on the left choose the FullTensorIntegration Query There is a drop down box that gives the inegration options The default is to use Tez Tnz Tzz to estimate Tz As we are doing a gravity gradient grid you should also Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 12 Library Help Top q Back gt convert from Eotvos back to mGal This involves dividing the result by 10000 ntrepid_Grid_Filter g ib Dooe R Help aa Nyquist 0 00625 cyr q H i A ee 1000 Fundamental 000003165 cyc ailable FFT Filters Filtering Process FullTensorIntegration Query Properties nue Input Grid Dataset Component Tez Inz Tzz to Tz n Pass Pre FFT Grid Conditioning jh Pass Filter 1 FullTensorIntegration Query v Convert Eotvos to mGal nd Pass lt Post FFT Grid Restoration therworth Output Grid Dataset ectional Cosine Set the output grid dataset name by clicking in the middle panel on the last entry This switches to the output name panel Type in aurizonia_Tz ers Now hit the Apply button and watch the integration process being calculated then reported in the right hand side bottom panel gt E PP Intrepid_Grid_Filter a O arrn b aam Ss ios a File Help Continuation i a aa ees Nyquist 0 00625 cydes m ey H f
6. discussion there is still the factor of the missing Gzx amp Gyz measures when the integration to Gz is attempted Filter operations supported Low Pass High Pass Band Pass Butterworth Continuation Integration The all important sign convention for the field components completely dominates the result that is achieved so it is very easy to make an error here if you are not careful Hence you are given direct access to a GUI component to experiment with the END NED ENU state so that you can also examine the consequences of getting this wrong Tensor Integration example The sample_datasets cookbook tensors Aurizonia A_2_ Grids contains a tensor grid from Brazil 1 Launch grid filter from the project manager tool Choose the grid dataset aurizonia_T_fa_tensor_mitre ers The tensor Field components coordinate p lyquist 0 H a A z ct ala Fund eR er T 2 FFT Filters Filtering Process Input Grid Dataset ation a z3 Input Grid C halele leaa A 2 GRIDS aurizonia_T_fa_tensor_mitre er is Pre FFT Grid Conditioning 35 Post FFT Grid Restoration Save FFT of Input Grid iss te Output Grid Dataset orth tal Cosine wrIntegraton Query an Input Band ef Coord System Type iew Spectral Image View Radial Power Spectrum After reference frame is shown in the RED circle as END or East North Down This is the normal left handed convention used
7. we are not showing These however can be seen via the Visualization tool is required The FFT tensor grid is stored behind the scenes as a 12 band ERMapper grid carrying complex coefficients INTREPID suggest you repeat this exercise this time varying the number of partial derivative gradient components in the integration and also varying the Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 13 Library Help Top 4 Back gt END NED ENU setting to explore how misleading the answer can be if you i inwepid crriter yy I a l a E ee Nyquist 0 00625 cydes m Fundamental 0 00003165 cycles m Available FFT Filters Filtering Process Output Grid Dataset Continuation gt Input Grid Dataset Filtered Grid File Low Pass Pre FFT Grid Conditioning C tensors Aurizonia A_2_GRIDS aurizonia_Tz ers High Pass Filter 1 FullTensorIntegration Query Data Format Band Pass oo Post FFT Grid Restoration IEEE4ByteReal Butterworth Output Grid Dataset Directional Cosine vr Spatial View Spectral Image View Radial Power Spectrum Input Spectrum Filter Response Filtered Spectrum Amplitude Phase EigenValue2 Amp Amplitude Phase Amplitude Phase have a wrong setting for this work Other filters you can try The following table contains a list of filters suggested parameters and required outpu
8. INTREPID User Manual Spectral domain FFT grid filters G16 1 Library Help Top q Back gt spectral domain FFT grid filters G16 Top The INTREPID Spectral Fourier Domain Grid Filter Tool GridFFT provides a range of filtering options to generate the grid enhancement products that aid interpretation The tool delivers fast graphical feedback in both the spatial and frequency domains and also displays radial power spectra The following illustrations shows the GridFFT tool firstly for standard scalar magnetic data and then secondly automatically adapting to a Full Tensor Gravity gradiometry grid The process illustrated is an integration of the tensor to estimate a Gz signal a Intrepid Grid Filter C Intrepid tutorials_master Geosoft_datasets mlevel_grid_geosoft qrd 15 x w Nyquist 0 0062 cy m Bel oo Fundamental 0 000083 cy m Directional Cosine Properties j Filtering Process Low Pass Input Grid Dataset i n Azimuth 45 0 deg High Pass Pre FFT Grid Conditioning Band Pass Filter 1 Directional Cosine Horizontal Derivative Post FFT Grid Restoration Speer e a i Vertical Derivative Output Grid Dataset f Pass C Reject Reduction Continuation Analytic Signal z Total Horizontal Derivative Hilbert Transform Pseudo Gravity xj Spatial View Spectral Image View Radial Power Spectrum Input Spectrum Aw Filter Response Filtered Spectrum
9. ao EA x1 zmen Fundamental 0 00003165 cydes m Available FFT Filters Filtering Process Output Grid Dataset Low Pass Input Grid Dataset Filtered Grid File High Pass Pre FFT Grid Conditioning C V4 5 sample_data cookbooks tensors Aurizonia A_2_GRIDS aurizonia_BG_200_tensor_mitre_FILT ers aii Band Pass Filter 1 FullTensorIntegration Query Data Format Butterworth e Post FFT Grid Restoration IEEE4ByteReal X Directional Cosine Output Grid Dataset Spatial View Spectral Image View Radial Power Spectrum Before 5 Examine the Spectral Image view for a tensor grid This contains two eigenvalue grids plus the rotational or Phase grid This is on the left hand side representing a full accounting of the tensor griud signal expressed in the least number of independent grids possible The justification for this statement is that the invariant properties of a tensor can be found by doing a principal componentsanalysis or in other words solving the eigenvalue system and keeping track of the 3D rotations required at each point in the grid As the LaPlace relationship also holds for the eigenvalues any two eigenvalues also holds the third hence the need to only show two amplitude grids The rotational transform can be expressed in Quaternion form and INTREPID chooses to show just one manifestation of this data in grid form the so called Phase There is also a MODULO and an EigenAxis display for this rotational data
10. d click Open The INTREPID grid dataset GridFFT window appears _ i P Intrepid_Grid_Filter E _ _ _ o M am o a a _ w mi gt m mie n File Help i Esky aa Nyquist 0 00625 cyd A H J A lk zum Fundamental 0 00008333 cyd Available FFT Filters Filtering Process Input Grid Dataset Low Pass gt Input Grid Dataset Input Grid C Intrepid V4 5 sample_data guided_tours jntrepid_datasets mlevel_grid ers a High Pass d Pre FFT Grid Conditioning Band Pass F y Post FFT Grid Restoration Save FFT of Input Grid Horizontal Derivative Output Grid Dataset Vertical Derivative e Input Band No 15 Reduction Continuation IGRF IGRF Analytic Signal Spatial View Spectral Image View Radial Power Spectrum Before After viR m You can specify the input output and parameters for the Vertical Derivative filter process in this guided tour using the job file ch14_1 Job If you wish load it into the JOB Spectral Domain Grid Filters tool as described in Section Task specification job file Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 5 Library Help Top 4 Back gt short cuts in INTREPID Guided Tours Introduction G01 then go to Step 5 Choose a 3 Specify a Ist order Vertical Derivative filter eae a From the list of Available FFT Filters on the left hand side highligh
11. d gravity grid into curvature gradient grids A Yes use Tensor Query to select the curvature gradient option you require Library Help Top 2012 Intrepid Geophysics 4 Back gt
12. epid Intrepid4 5 nnn then you can find the INTREPID format sample data at C Program Files Intrepid Intrepid4 5 nnn sample_data guided_tours intrepid_ datasets This is the default location for the sample data If you have installed INTREPID normally the data resides there If you have installed INTREPID elsewhere the exercises will work just as well Just use the appropriate pathnames 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 3 Library Help Top q Back gt For more information about installing the sample data see Sample datasets installing locating naming in INTREPID Guided Tours Introduction G01 For a more detailed description of INTREPID datasets see Introduction to the INTREPID database G20 For even more detail see INTREPID database file and data structures R05 Location of sample data for CookBooks Right next to the Guided tours data is a rich set of more exotic geophysics datasets and grids already prepared for the cookbook training sessions A casual user might also gain some trial and error insights into the capbilities of the software just by testing the Project Manger s ability to preview and describe the attributes of each of the cookbook datasets Should you complete this guided tour W This guided tour is intended for intermediate level users Its process is more complex than that of an introductory tour and its in
13. es m 7 Toggle between Wavenumber and Wavelength to alter the display At the top of the tool there are buttons which will toggle the display between Wavenumber and Wavelength The x 1 and x 1000 buttons toggle the Wavenumber display between cy m and cy km and the Wavelength display between m and km 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Library Help Top 8 Spectral domain FFT grid filters G16 7 4 Back gt Intrepid_Grid_ Filter File Help Available FFT Filters Filtering Process Pre FFT Grid Conditioning Post FFT Grid Restoration Output Grid Dataset High Pass Band Pass Horizontal Derivative Optional Compare the results with the original grid Compare the original grid mlevel_grid and the solution dataset provided vd_grid using a sun angle display in the Windows Visualisation Tool or UNIX Visualisation tool You can task switch to the Project Manager start the Windows Visualisation Tool or UNIX Visualisation tool and view the datasets immediately or wait until you have finished this guided tour Note vd_grid is a solution dataset provided by us which is identical to vd_grid1 See Visualisation tools GO5 for visualisation tool instructions Tip You can launch two copies of the tool load a different grid into each one and place them side by side on the screen for best comparison Intrepid Visualisation Zoom In Zoom Previous
14. lt in a diff ers grid 14 Exit from the Grid FFT tool From the File menu choose Quit Tensor Gradient Filters Library Help Top INTREPID have developed several quite distinct workflows and algorithmic strategies for dealing with aspects of tensor gradients Challenges include padding strategies minimum operations counts to perform a FTG FFT transform designing transfer functions to integrate several gradient components to recover as much of the original vector components of gravity as possible This last one is well worth some reflection It is commonly thought that integrating Gzz to estimate Gz does the job WRONG At the very least the other two partial differentials of Gz ie Gxz and Gyz typically contain at least one third of the total original signal as rotational or torsional contributions So if your favourite instrument did not measure all the tensor gradients you are bound not to be able to recover all the original magnitude A special discussion about FALCON is warrented however The Hilbert pair of horizontal gradient components that is measured in this system directly contains the full Gzz signal magnitude due to a close relationship with the LaPlace trace condition 1e Horizontal Curvature Gradient Guv Gne lt gt Gzz 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 11 Library Help Top 4 Back gt LaPlace Trace Gxx Gyy Gzz 0 In this
15. noii Spatial View Spectral Image View Radial Power Spectrum Before Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 10 Library Help Top Compare the original and filtered grids Exit lt 4 Back gt 12 Optional Compare the results with the original grid Compare the original grid mlevel_grid and the solution dataset provided dircos_grid using a sun angle display in the Visualisation Tool You can task switch to the Project Manager examine the thumbnail views or start the Visualisation Tool and view the datasets immediately or wait until you have finished this guided tour Note dircos_grid is a solution dataset provided by us which is identical to dircos_grid1 See Visualisation tools G05 for visualisation tool instructions Tip You can launch two copies of the tool load a different grid into each one and place them side by side on the screen for best comparison Intrepid Flight Path Editor 3 1d Intrepid Flight Path Editor 3 1d File Edit Line Display PointDisplay Grid Display Window Help File Edit Line Display Point Display Grid Display Window Help Before directional cosine filter After directional cosine filter mlevel_grid dircos_grid 13 Create a difference grid Load both grids into the spreadsheet editor Use Create Field to subtract one grid from the other and store its resu
16. ool to view the grid before and after each process if you wish Filters supported Currently GridFFT provides the following filters Low Pass High Pass Band Pass Horizontal Derivative Vertical Derivative Reduction to Pole or Equator Analytic Signal Total Horizontal Derivative Directional Cosine Hilbert Transform Pseudogravity Matched Filter Tensor Queries Tilt Angles For Full Tensor Grids Low Pass High Pass Band Pass Integration to Gz and Reduction to Pole For FALCON Optimized padding Integration to estimate Gz Find Gzz Phase checking of instrument calibration Context of this guided tour Library Help Top In the context of your data processing cycle this tour represents further enhancement of data that has already had its noise spikes and faulty flight path segments removed been decorrugated and microlevelled then gridded Location of sample data for Guided Tours We provide two complete sets of sample datasets one in INTREPID format and one in Geosoft format INTREPID works equally well with both formats When you want to open a dataset navigate to the directory containing the required data format Where install_pathis the path of your INTREPID installation the project directories for the Guided Tours sample data are install_path sample_data guided_tours intrepid_ datasets and install_path sample_data guided_tours geosoft_datasets For example if INTREPID is installed in C Program Files Intr
17. rve the process in the Grid Filter window ial Choose Apply in the Grid Filter window INTREPID will apply the filter save the output dataset and display a Spatial View representation of the filter process in the window Click on the Spectral Image View tab or the Spatial View tab to toggle between the Spatial and Fourier representations of the input and output datasets Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Library Help Top View the radial power spectrum Measure depth of a spectrum segment Library Help Top Spectral domain FFT grid filters G16 4 Back gt 6 Pl Intrepid_Grid_Filter File Help ARA Nyquist 0 00625 cydes m Ey gt Hi Z nal ae EHH Fundamental 0 00008333 cydes m Available FFT Filters Filtering Process Input Grid Dataset Low Pass gt a Input Grid C Intrepid V4 5 sample_data guided_tours intrepid_datasets mlevel_grid ers amm High Pass J Pre FFT Grid Conditioning Band Pass F Filter 1 Vertical Derivative F Save FFT of Input Grid Horizontal Derivative Post FFT Grid Restoration Reduction Output Grid Dataset Input Band No 15 Continuation Analytic Signal IGRF Total Horizontal Derivative X Spatial View Spectral Image View Radial Power Spectrum a Input Spectrum Filter Response Filtered Spectrum Amplitude Phase Amplitude Phase Amplitude
18. structions are less detailed If you are a beginner or wish only to have a brief overview of INTREPID s capabilities you can omit this guided tour Spectral domain FFT grid filtering is however a fundamental geophysical data process You should not omit it from a thorough evaluation of INTREPID s capabilities What you will do Flowchart Summary Library Help Top Process Outputs Grid New Grid datasets Specify filters dataset Examine Power _ Spectum 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 4 Library Help Top 4 Back gt Steps to follow The following table summarises the output files filters and parameters to be used CRY 23 eas Parameters Input dataset Output dataset Solution you create dataset supplied Vertical Order 1 0 mlevel_grid vd_gridl vd_grid derivative Directional Direction 135 Cosine mlevel_grid dircos_gridl dircos_grid cosine filter function degree 2 Pass option Launch the 1 Start the Project Manager Navigate to the directory Spectral install_path sample_data guided_tours intrepid_ datasets Start ial Filters the Spectral Domain Grid Filters tool by choosing Grid_FFT from the Filtering too menu INTREPID displays an Open dialog box requiring you to enter the name of the input grid you wish to filter Load the input 2 Specify mlevel_grid as the input dataset an
19. t Vertical filter Derivative Add the filter to the filtering process by clicking on the upper gt button The filter description will appear in the box labelled Filtering Process In the right hand side panel INTREPID will display the Vertical Derivative Properties Choose the default setting of order 1 You can specify any integer order up to a maximum of 10 Available FFT Filters Filtering Process Low Pass m Input Grid Dataset High Pass Pre FFT Grid Conditioning Band Pass l Filter 1 Vertical Derivative Horizontal Derivative i Post FFT Grid Restoration Output Grid Dataset Continuation Analytic Signal Total Horizontal Derivative 4 Specify vd_grid1 as the output dataset In the panel labelled Filtering Process highlight the Output Grid Dataset entry The display parameters in the right hand panel will change to reflect your choice The output Filtered Grid is given a default name of mlevel_grid_FILT You can change this output file name by clicking on the small box to the right of the name A chooser will appear Type in the name vd_grid1 and click Save As The Filtered Grid Name will be updated to reflect your choice Filtering Process Output Grid Dataset Pre FFT Grid Conditioning C Intrepid v4 S sample_data guided_tours intrepid_datasets yd _gridLers m Filter 1 Vertical Derivative Data Format Post FFT Grid Restoration TEEE4ByteReal Output Grid Dataset Apply the filter 5 Apply the filter and obse
20. t dataset names for some further Spectral Domain Grid Filter exercises that you may wish to complete In each case use mlevel_grid as the input dataset Parameters Output dataset Solution you create dataset Upward 250m ori ori Continuation ch14_3 job Downward Continuation level 80m Use Damping Continuation Damping degree 5 ch14_4 job Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 14 Library Help Top 4 Back gt Reduction to the Calculate Earth s magnetic field by clicking rtp _gridl rtp grid Pole IGRF in Reduction Properties panel earn i Enter parameters Year 1990 8 Altitude 0 1 km Choose OK INTREPID loads correct parameters automatically into the Reduction Properties High Pass filter Cutoff 0025 cy m Default rolloff pass_gridl pass_grid ch14_6 job Under the name of each filter is the corresponding job file that you can use to automatically specify the task If you wish to use a job file repeat steps 9 12 loading JOB the required job file into the Spectral Domain Grid Filters tool as described in Section Task specification job file short cuts in INTREPID Guided Tours Introduction G01 then choose Apply Examine the results using a visualisation tool if required You can find detailed instructions for using the filters in INTREPID General Reference Key points for this guided tour In this guided
21. tour you used the Spectral Domain Filter tool to Transform a grid dataset to the Fourier domain using a Fast Fourier Transform Enhance the grid using A 1st vertical derivative A directional cosine filter One or more other filters Transform the enhanced grids back to the spatial domain After applying the filters you could have examined the results using a visualisation tool Frequently Asked Questions Q Can I process large grids A The INTREPID FFT Grid Filter tool supports very large grids through the implementation of tiling methods Q Do I have to repeat the FFT process every time I use the FFT Grid Filter tool A No When you first use it on a grid dataset INTREPID saves a copy of the transformed dataset which it can use from that point onwards Q How can I find out the Nyquist frequency for a grid A The tool automatically computes the Nyquist and Fundamental frequencies for the input grid Q I want to design a low pass filter in terms of wavelengths not frequencies A The tool allows you to toggle between the frequency and wavelength domains The filter parameters will be adjusted automatically Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Spectral domain FFT grid filters G16 15 4 Back gt Library Help Top Q Can I run the filter as a batch job A The INTREPID batch language provides full support for this tool Q Can I transform standar
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