trace display

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Trace Display3278 ProMAX Reference

Other Docs Known Problems

Trace Display

Trace Displayis a general purpose tool for displaying andinteracting with prestack and poststack seismic data.

Theory

This interactive process displays on screen gray scale, color,wiggle trace, variable density plots. Wiggle trace can also beoverlain on variable density plots. You can zoom and pan thedata display, view trace headers, and pick horizons, mutes,gates, and first breaks. The pick data can be written toparameter files for later use in processing. Many of the

display parameters can be altered while the data is displayedwithout re-running the display flow.

Trace Display has an integrated neural net first break pickerwhich can be created and trained interactively. While theneural net picker runs, you may QC and, if necessary, retrainthe neural net.

Usage

Unlike the olderScreen Displaywhich Trace Displayreplaces, Trace Display can be used more than once per flowwithout writing an intermediate dataset. The results fromearly processing steps can be viewed to satisfy QCrequirements while the data is passed down the flow to beviewed again after more processing. The first display can beterminated without stopping the processing flow.

While you are usingTrace Display, you may need to accessthe traces of your dataset. For example, to change the tracesort list or create a subset of selected traces in your dataset.You can dynamically change the trace sort by using theInteractive Data Accesstool. However, this tool must beturned on in Disk Data Input.

Parameters

Select display DEVICE

SelectThis Screen to plot the display on the current screen.Enter the name of the display device including the display
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number and screen number, multi-screen displays tooverride the current display default. For example:

workhorse:0

specifies display number 0 on the host workhorse.

workhorse:0.0

specifies screen 0 on display 0 on the host workhorse.

Specify display START time

Enter the starting time in ms. to display at the top of thescreen. Samples above the starting time will be clipped.

Specify display END time

Enter the ending time in ms. to display at the bottom of thescreen. Samples after the ending time will be clipped. Enter0to display all samples after the starting time.

Maximum number of TRACES/screen

Enter the maximum number of traces to display on thescreen at one time. Enter0, the default, to automaticallydetermine how many traces to display.

Traces to overlap between screens

This appears if a>0 forMaximum number oftraces/screen.Enter the number of traces to overlapbetween screens. For example, if you enter a value of 10,whenever you load new traces, 10 traces from the previousscreen will remain in the next screen. This feature is usefulfor picking horizons on stacked data. The horizon picks fromthe previous screen will show up on the first 10 traces of thenext screen and serve as a guide when you continue pickingthe horizon.

Number of ENSEMBLES (line segments)/screen

Enter the maximum number of trace ensembles to bedisplayed on the screen at one time. If the data is stackeddata, line segments are treated as ensembles. When TraceDisplay loads and displays traces, it continues loading and

displaying until it reaches either this limit or the Maximumnumber of Traces/screen.
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Trace GAP between ensembles

This appears if>1to Number of Ensembles/ screen. Enterthe gap width in traces between ensembles when displayingmultiple ensembles per screen. Enter2to put a two tracewide gap between each shot record or CDP ensemble. Note:

This parameter is independent of the Number ofTraces/screen. If you specify 120 traces/screen and a 2 tracegap between ensembles, Trace Display automatically figuresin the extra 2 trace space when it displays the traces.

Ensemble increment

This appears if0to Maximum number of Traces/screen.Enter the number of ensembles between successive screens.Enter0, the default, to increment by the Number ofEnsembles/screen. If the value is less than the value ofNumber of Ensembles/screen, some ensembles from thecurrent screen will be overlapped onto the next one. If thevalue is greater than the Number of Ensembles/screen, someensembles will be skipped.

For example, to look at every 10th shot record with one shotrecord on the screen at a time, specify 1 for Number ofEnsembles (line segments)/screen and 10 for the Ensemble

increment.Stacked data is considered to be an ensemble.

Do you want to use variable trace spacing?

SelectYes to position the traces by the sort key values. If thesecondary sort key has duplicate values, Trace Display willrevert to fixed trace spacing.

Output ModeSelect the output mode from:

When Donereturns traces to the flow when you displaythe next screen. This is the default.

Immediate returns traces to the flow as soon as they areread. Immediate is useful if the flow has two Trace Dis-plays because you can look at traces before and after aset of processes. Since the first Trace Display returns

the traces to the flow immediately, the following tools willoperate on them and the second Trace Display can dis-


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play the result. Note: Editing of trace header values isdisabled in this mode.

Trace display MODE

Select the display mode. The choices are:

WT/VAdisplays traces in wiggle traces/variable areamode.

WT displays traces in wiggle trace mode.

VAdisplays traces in variable area only mode.

Color displays traces in variable density color mode.

Grayscale displays traces in variable density grayscale

mode.

Offset BIAS for variable area

This appears ifWT/VAorVAtoTrace display Mode. Enterthe percent bias to have on the variable area fill. A positivevalue will shift to the left of the zero line of the trace withmore black. A negative value will result in less black.

Display color bar?

This appears when GrayscaleorColor to TracetoTracedisplay MODE. SelectYesto display the color bar.

Header Plot Parameter

Select a trace header from the Headers menu to plot. SelectNo trace header entry, the default, to not plot any traceheaders. You can always add trace header plots later usingthe interactive controls within Trace Display.

Automatically SAVE screens?

SelectYes to automatically save an image of each new screen.You can then use the animation tool to review these savedscreen images for comparison.

Maximum number of screen images to save

Enter the maximum number of screen images to maintain.

Once this number is exceeded, older images will be deleted asnew ones are saved.


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Caution: Each screen image can require as much as 1megabyte of memory.

Save screens in Color?

SelectYesto save screen in color. Color screen imagesrequire approximately 8 times more memory than black andwhite images.

Where to save screen images

Select where to save screen images. The options are X Serverand Program.

Images stored in X Servercan be retrieved and displayedmuch faster than images stored in program memory.However, some X Servers, particularly X terminals, have alimited amount of memory available for storing screenimages. If your terminal is directly connected to aworkstation try saving screen images in the X Server.

If you store screen images in program memory, the number ofimages you can save can be much larger, limited by theavailable swap space. However image retrieval time will bemuch longer. If you are using a network connected Xterminal, you may want to store screen images in the TraceDisplay program.

Number of screens to collect

This appears ifYes toAutomatically save screens. Enterthe number of individual screens to save, before reviewingthem. This parameter is ideal for saving up parameter testsprior to reviewing the results. Saved screens can only bereviewed and compared; they can not be interacted with in

this mode.

DIRECTION of trace plotting

Select the trace display direction of your shots, CDPs, orstacked traces:

Left to Right, the default, displays the traces with thelow numbers starting on the left-hand side of the screen.

Right to Leftdisplays the traces with the low numbers

starting on the right-hand side of the screen.


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This option has nothing to do with the polarity of your data.

POLARITY of trace display

Select the polarity for traces display, the actual amplitudevalues are not altered:

Normal, the default, displays the positive amplitude ofnormal polarity traces to the right of the zero baseline.

Reverseddisplays the positive amplitude of reversedpolarity traces to the left of the baseline.

Primary trace LABELING header entry

Select a trace header word to use as the primary or top label

trace label. For example, select SOURCE or CDP for shot orCDP ordered data. A primary trace label is not required.SelectNoneto disable the top trace annotation.

Secondary trace LABELING header entry

Select a trace header word to use as the secondary or bottomtrace label. For example, select CHAN, SOURCE, REC_SLOC,OFFSET, or CDP. The default is CHAN.

A secondary labeling header is not required. SelectNonetodisable the secondary trace labeling.

MODE of Secondary trace annotation

Select the secondary trace annotation mode. This specifiesthe frequency of the secondary trace annotation. The choicesare:

Incrementallabels the first trace and every Nth tracethereafter. Thus a value of 2 would annotate traces 1, 3,5, 7, etc. This is useful for annotating offsets, channels,and fold.

Multiple labels a trace if the header falls on a multiple ofthe chosen increment. Thus a value of 5 would annotateall traces whose secondary labeling header value is divis-ible by 5. This is useful for annotating CDPs and receiv-ers.

Differentlabels the first trace, or every trace, if the

header value is different from the previous trace.


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Note: Trace Display decimates the annotation frequency toavoid overplotting of annotation. If this occurs, theannotation frequency increases to the specified value as youzoom in.

INCREMENT for Secondary trace annotationThis appears if eitherIncrementalorMultipleto Mode ofSecondary trace annotation. Enter the increment to use forthe bottom trace annotation.

Trace scaling mode

Select the trace scaling mode from:

Conventionaluses conventional trace scaling in con-

junction with the selected scaling option. This is thedefault and is better for trace data.

Range-limiteduses range-limited scaling whichincludes a bias. Ideal for F-K type data and dB downtype data.

Conventional scalingworks in the following manner:

Divide trace amplitudes bytrace scaling optionvalueselected.

Multiply all samples by a scalar to enhance the display.

Multiply all samples by the additional scalar.

Multiply all samples by the polarityvalue.

Clipall amplitudes on the trace.

Rasterize the trace amplitudes.

Range-limited scalingworks in the following manner:

Subtract (MIN+ MAX) / 2 from every sample.

Divide every sample by (MAX- MIN) / 2.

Multiply all of the samples by the polarityvalue.

Rasterize the trace amplitudes using aClipvalue of 1.0.

Note: The amplitudes shown in the coordinate line at thebottom of the screen are the original unscaled amplitudes.


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Any traces which contain NaN, not-a-number, values arekilled before scaling, with the trace data and header actuallychanged.

Trace excursion at which to CLIP

This appears ifConventionaltoTrace scaling mode. Enterthe number of trace excursions for data to cross before beingclipped. Enter2, the default, to clip at the second tracecrossing away from the current trace. An amplitude of CLIP isrepresented by an excursion of plus or minus CLIP tracespacings.

For color displays, an amplitude of 0.0 is represented by thecentral color, an amplitude of +CLIP will be represented bythe hottest color, and an amplitude of -CLIP will berepresented by the coldest color.

SCALAR for sample value multiplication

This appears ifConventionaltoTrace scaling mode. Enterthe additional scalar to multiply the trace sample valuesbefore display. The default value is 1.0. This value is appliedafter actual trace scaling.

Use a smaller value, such as 0.3, for picking first breaktraces, or 2.0 for scaling data displayed in one of the colordisplay options. Data can be gained with a higher value of 1.5or 2.0.

Trace scaling option

This appears ifConventional forTrace scaling mode. Selectthe option for scaling displayed traces. The choices are:

Individual scales each trace individually by dividing the

trace amplitudes by the mean absolute value of thetrace. This is the default.

Entire screenscales all traces in an ensemble by divid-ing the trace amplitudes by the mean absolute value ofall traces.

No scaling applies no additional trace scaling.

The amplitudes shown in the coordinate line at the bottom ofthe screen are the original unscaled amplitudes.


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Get min/max amplitudes from the data?

This appears ifRange-limited toTrace scaling mode. SelectYes to extract the minimum and maximum amplitude valuesfor scaling from the data. SelectNoto enter the min/maxamplitude values.

Specify minimum amplitude to display

This appears ifNoto Get min/max amplitudes from thedata. Enter the minimum amplitude to display, withoutclipping. In color, this will correspond to the first color in thecolorbar.

Specify maximum amplitude to display

This appears ifNoto Get min/max amplitudes from thedata. Enter the maximum amplitude to display, withoutclipping. In color, this will correspond to the last color in thecolorbar.

Number of display panels

This appears if0forMaximum number of Traces/screen.Enter the number of display panels to create. Enter1, the

default, to display one window of traces. Enter a value greaterthan one, to split the window into multiple panels of tracedata.

You can display multiple panels of traces for applications likefirst break picking where it is desirable to see more shotrecords, but with a smaller time range in each. You mightalso use this option to view multi-component data, splittingeach component into a different panel.

Split data by

This appears if>1toNumber of display panels. Select howto split the traces into the display panels. Choices are:

Ensemblesplits the incoming data at ensemble bound-aries. For example, the first set of traces go into the firstpanel and the second set into the second panel. In thiscase, the Number of Ensembles/screen determineshow many traces go into each panel. For example, youwould split the data byEnsembleto display multipleshot records for first break picking.


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Demultiplexdemultiplexs the incoming data into thedifferent display panels. For example, if you select 3 dis-play panels and split byDemultiplex, the first trace willgo into the first panel, the second trace into the secondpanel, the third trace into the third panel, and the fourth

trace will go into the first panel. Use this option for dis-playing multi-component data with each componentmultiplexed together. Note: It is important that the num-ber of display panels be consistent with how the tracesare multiplexed. View 3 component data in two displaypanels results in a confusing picture.

Trace Orientation

Select the trace orientation:

Vertical, the default, displays vertically oriented seismictraces.

Horizontalplots traces horizontally, with time increas-ing to the right and trace numbers increasing from top tobottom. Trace numbers increase from bottom to top ifdisplay direction is set to Right to Left.

Interactive Display

After running this process, an interactive display window willappear. The graphic below is an example.


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Views

Trace Display Window

Click on a menu item or icon above and jump to the explanation.

Menu bar

The menu bar contains the five pulldown menus shownabove plus the Help menu. When commands in the menu barare not appropriate, they are grayed out.

Menu BarIcon Bar

Mouse Help Data Display

Trace Header Plot

Active Icon

View
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Commands that pop up dialog boxes end in an ellipsis (...).Commands that bring up a fly out menu for additionalchoices end with >.

Keyboard Shortcuts

Each menu may be accessed via the keyboard. The keyboardshortcut for the menu bar is an key in combinationwith the underlined letter. Then choose the submenucommand by typing the underlined letter for that command.For example: -F, S will bring up the File menu and SavePicks.

The following describes each menu bar command.

File menu

The file menu commands are:

Save Pickssaves any picks made since the last save.

Hardcopy > generates a hardcopy print of the screen oneither a printer or a plotter:

Printerprints to a printer. This command uses thescreendump command in the config_file. The default isto print to a Postscript printer.

Plotterprints to a plotter. This command usesscreendump.exe.

Next Screendisplays the next screenful of data. Whenno more data is available, this command is grayed out.Same as the Traffic Light icon. This works the same asthe icon.

Previous Screenmoves backward by one frame. Thisworks the same as the icon.

Rewindmoves backward to the first frame. This worksthe same as the icon

Exit/Continue Flowexits and continues the flow. Youare asked to save picks before exiting.

Exit/Stop Flowexits Trace Display and stops the flow.You are asked to save picks before exiting. Note: Thiscommand stops the ProMAX flow, but not other sockettools such as Trace Display. You must exit multiplesocket tools in a flow individually.


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View menu

The view menu commands change the appearance of thedisplay.

Trace Display...controls trace display parameters.

Trace Scaling...controls trace scaling parameters.

Trace Annotation... controls the trace headers used forthe primary and secondary trace annotation.

Header Plot >manages trace header plots in the plotarea above the traces. It has two submenus:

Plot On... toggles the header plot on/off. This commandis grayed when there are no trace header plots defined.

Configure...adds, removes, and changes trace headerplots. The dialog box is shown below.

Configure Trace Header Plots Dialog

Select a trace header entry from the left-hand side to

plot. Select a plot to change or remove from the right-hand list.The Remove button removes the plot


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highlighted in the right hand list. Line Color and LineWidth are option menus that change the plot attributesof the trace header entry selected in the right-hand list.

Edit Colormap edits the colormap used to display seis-mic traces.

Colorbar displays the color bar on the right-hand side ofthe screen, if Color or Grayscale is selected inTrace Dis-play Mode. The colorbar is used to track amplitudes. Asyou move your mouse around your trace display, the col-orbar moves accordingly.

Animation

The animation menu applies to saving and replaying screen

images. Save Screensaves the current screen image. Any picks

and annotation on the screen are saved along with thetrace data.

Animatereviews the saved screen images.

The animation dialog is used to review the saved screenimages, step through the images manually or cycle throughthem automatically. It controls the speed of playback, limits

the set of displayed frames, and deletes unwanted frames.

Animation Dialog


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Speed Controlcontrols the playback speed for auto-matic, faster on the right, slower on the left. This controlis active even during an animation sequence.

Frame Control shows the current frame. Drag the sliderto position the frame of interest.

Start Framesets the start frame to the currently dis-played frame. Animation sequences operate between thestart and end frames.

End Frame sets the end frame to the currently displayedframe.

Manualtoggles manual mode on/off. In manual mode,the Cycle, Ramp, and Toggle controls step one frame at atime and ignores the speed control setting.

Delete deletes the currently displayed frame. The startand end frame will be updated appropriately.

Rewindsteps backward to the first frame.

Backsingle steps backward by one frame.

Cycle cycles through the saved frames from start to end,and back.

Ramp ramps through the saved frames from start up to

end, back down to start.

Toggletoggles between the start and end frames.

Stop stops an animation sequence started by Cycle,Ramp, or Toggle.

Forwardsingle steps forward by one frame.


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Endsteps forward to the last frame.

Cancelcloses the animation dialog box.

Picking menu

The Picking menu applies to selecting objects to pick. Each ofthese commands will popup a dialog box showing a list ofexisting objects, tables, lists, database entries, etc. The dialogalso contains a place to enter the name of a new object.Either select an existing object or enter the name of a new

one. Then clickOKorApply. Note: If you click Apply, thedialog box remains on the screen and you can select or createanother object.

If you enter the name of a new object, another dialog boxappears showing Trace Header entries. Select one of theTrace Header entries for a secondary key. ClickOKto createthe object orCancelto cancel the entire operation.

The following choices are in the picking menu. Commands

that are not appropriate for current data are grayed out:

Kill TracesReverse TracesPick Top MutePick Bottom MutePick Top Mute (WB_TIME relative)Pick Bottom Mute (WB_TIME relative)Pick Surgical MutePick Miscellaneous Time Gates

Pick Miscellaneous Time Gates (WB_TIME relative)Edit Header Values (first breaks)Edit Database Values (first breaks)Pick Autostatics HorizonsPick Other Horizons

First Break Picker menu

The first break picker gives you the opportunity tointeractively create and train a neural network to pick first

breaks. Even though the actual picking is performed fromwithinTrace Display, most of the time the neural network is


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used in batch mode using the Neural Network FB Pickertool.A means is provided for you to QA the picks. Once thenetwork is able to pick first breaks to your satisfaction, thenetworks weight matrix is stored as a standard ProMAX tableand can be used from other process. For a more detailed

description of the mechanics of an artificial neural network,refer to the helpfile forNeural Network Reversed TraceTraining.

Trace numbers must be valid for this process to work.Without valid trace numbers, the Neural Network menu isnot displayed inTrace Display. The Neural Network menucontains the following commands:

Set Neural Network Parameters allows you to set thefollowing parameters, which must be set before training

of the neural network can proceed. Once set, the param-eters can be modified at any time during execution. How-ever, resetting the parameters without retraining theneural network might cause the network to fail.

Pick polaritypicks are shifted down in time dependingon the option selected. Shifting improves pickconsistency in noisy data and decreases the number oflocations for the network to consider as potential picks,thus improving speed and accuracy.

Peakshifts the pick down to the nearest peak below theactual first break pick.

Trough shifts the pick down to the nearest trough belowthe actual first break pick.

Zero - to +shifts the pick down to the nearest negativeto positive-going zero crossing below the actual firstbreak pick.

Zero + to - shifts the pick down to the nearest positive tonegative-going zero crossing below the actual first breakpick.

Signal and Noise gate length (in ms)is the length ofthe leading and trailing windows used to analyze thecharacteristics of each of the example peaks. It isgenerally recommended that the gate length beapproximately 3 times the dominant frequency of thedata.


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Create Training Datasetcreates manual picks to usefor neural network training. Select an existing, or createa new, time gate to limit the search for the first breaks.

Once a gate is selected, two pick objects are created inmemory, the selected time gate table and FB Training

Data, which is a temporary pick object. The Pick icon isdisplayed on the left hand side of the screen. By default,FB Training data is the active object in the Pick Layerdialog box.

If the time gate is selected from an existing table, thegate will be displayed on screen. If a new gate is created,you can select the gate pick object from the PickManager and pick the gate. Remember that the gate hasto have two layers, the top and bottom gate. It is

generally recommended that the gate is wide enough toat least contains three peaks so that the neural networkcan consider more than one or two candidate peaks forpicking, but not overly large that the execution time getslengthy.

Since the training is performed interactively, thenetwork is equipped with the capability to performincremental learning. Therefore, you can create atraining dataset with as few manual picks as possible.

This assumes that if the net needs more data to learn,you can always create more manual picks and train thenetwork incrementally. Keeping the size of the trainingdataset to a minimal also speeds up the training process.Generally, for clean data, a quarter or one-half of a shotis all that is needed to train the network. For noisy datathe network might need the whole shot to train. Note:Snap the peaks to the nearest peak/trough/zerocrossings before starting the training process. If youshould forget to snap, the program will automaticallysnap picks before training according to the neural netparameters defined.

If you constrain the length of the traces in trace display(by specifying trace START time and trace END time), theneural net only picks whosebothtop and bottom gatesare within the start and end times of the trace.

Neural Net Training specifies where the neural networkweight matrix is stored in the database. If you select an

existing database table, the network performs an incre-mental learning. Otherwise a new network is created


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from scratch. During the training process, thewatchicon appears indicating the program is tied up. This isintended to prevent accidental modifications to the net-work parameters and training dataset.

Neural Net Recall allows you to apply the network to the

rest of the data, once the training is completed in the fol-lowing manner:

Continuous Recall applies the network to the currentand subsequent ensembles.

One time Recall applies the network only to the currentensemble. When using this option, you can deactivatethe previous picks from the display before asking for thenew pick. This will avoid overplotting of both attributes

Stop Recallstops this process.

When Recall is selected, a dialog box appears where youcan select or type a description for the NN_PICKattribute where the neural network picks are stored inthe database. Also set the following three parameters toperform neural network picking:

Maximum Trace to Trace Staticenters the allowabledeviation from the predicted arrival time. It should

reflect the maximum trace-to-trace static expected forthe line. This number is converted to static per unitdistance for use, and the geometry information for thetrace is used by the picker.

Starting offset for pickingenters the starting offset. Itis assumed this initial offset reflects a relatively lownoise, non-shingled area of the data. The picker will thenproceed from this starting offset to the local minima andmaxima within the ensemble.

Number of traces for median line fitenters thenumber of previous first break picks to establish thelocal slope of the first break picks. A median timeprediction is derived to predict the arrival time of thenext trace.

Since Recall creates a new pick object that can beselected from the Pick Manager dialog box, the neuralnet picks can be treated just like any other pickableobjects. If the neural net picks are generally acceptable

and only need a minor editing, you can edit them byhand. If the picks are mostly incorrect, you can create


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more manual picks and retrain the network, or adjustthe picking parameters. When retraining the network,you will want to add picks to or just edit the FB Trainingpick object and not your NN_PICK edits. FB Training isthe file used to retrain the network.

Purge Neural Net deletes the neural network from mem-ory. This in effect cancels all the training performed dur-ing the current execution of Trace Display. This is usefulif you want to start training from scratch or create a newneural network.

A typical scenario of picking first breaks using the neuralnetwork follows:

1. Set Neural Network parameters.

2. Create Training dataset.

3. Train the network.

4. Apply the network in current ensemble. If the picks areacceptable, go to step 5. Otherwise, pick some moremanual picks, and return to step 3. If you feel there areenough manual picks, adjust the picking parameters,such as the starting offset or trace to trace static. Alsocheck that the top gate closely follows the slope of the first

break.5. Apply the network in subsequent ensembles to QA the

picks. If some corrections are needed, pick a few manualpicks in the subsequent ensembles and return to step 3. Ifthe networks picks are satisfactory, picking can bestopped. Then use the process NN First Break Picker andrun in batch mode to pick the whole data set.

Help

Clicking on Help pops up a menu with two choices:

Mouse >Submenu with the following choices:

Coordinates enables coordinate display.

Buttons enables button help.

General enables general help.

All enables mouse help.

None enables all mouse help.


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Documentationbrings up this helpfile.

Icon Bar

The following commands are invoked using the icons on the

left hand side of the screen. Forwardshows the next screen full of data.

Back single steps backward to previous screens. If thereis no previous data available, this icon is grayed out.

Rewind steps backward to the first screen full of data. If

there is no previous data available, this icon is grayedout.

Save Image saves the current screen image. Annotationand picked events are saved with the trace data.

Animationbrings up the Animation dialog box. This

button is active only when there are at least two savedscreen images. For more information please see the Ani-mation discussion in the Menu bar section above.

Paintbrush toggles on/off picked kills, reverses, andmutes to the data. Click once to apply, click again tounapply. This tool is only active when you are pickingsomething.

Zoom Toolzooms a selected area by clicking and drag-ging MB1. If you release MB1 outside the window, thezoom operation is canceled. If you click MB1 withoutdragging, this tool will unzoom. You can use the zoomtool in the axis area to zoom in one direction only.

Annotation Toolallows you to add, change, and deletetext annotation in the trace and header plot areas. Thepointer changes to a circle when it is over text annota-tion. You can move an annotation by clicking and drag-ging MB1, or add new annotation by clicking MB1 whenthe pointer is not over an existing annotation. When thepointer is over an existing annotation, click MB2 todelete the text or MB3 to edit the text or change its color.


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Velocity Tool draws a rubberband line between thelocation of the first button click and the mouse pointer.The coordinate area will show the velocity implied by thisline. For prestack data, clickMB2and the velocity tooldraws a hyperbolic velocity function with its apex at the

zero offset location. Shift MB2locates the apex of thehyperbola where the mouse is clicked. ClickMB3whenthe velocity function is active to save an annotated copyof the displayed function.

Header Toolshows the trace header of a selected trace.The first section of the dialog shows the primary and sec-ondary sort keys. The second section shows the rest ofthe trace headers in alphabetical order. You can move,resize, and scroll the dialog box to position the headers.

.

Picking Toolappears when one or more pick objectsfrom the Picking menu are selected. When active, clickon MB1 to pick a point on a trace or click and drag topick a range of traces. When the mouse is over a pickedpoint, the pointer shape changes into a circle. Click anddrag using MB1 to move a picked point. Use MB2 to clickon a single point to delete it, or click and drag over arange of points to delete them. Click MB3 for additionalpicking options.


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Pick Manager

When the Picking Tool is active, the Pick Layer dialog boxwill popup for selecting a pickable object. Click on the objectname; it will become active and drawn in red. Click on theRemovebutton to remove this object only from the list of

pickable objects (this will not physically delete your file).

Picking Options

When the Picking Tool is active, you can clickMB3to popup

the following options for the current pick object: New Layeradds a new layer to the active pick object.This command is only active for objects with multiplelayers.

Projectprojects the interpolated display. Use this com-mand to see how the picks on the current ensemble areprojected onto the next ensemble(s).

Snap Peaksnaps picks to the nearest peak.

Snap Trough snaps picks to the nearest trough.

Snap Zero + to - snaps picks to the nearest positive tonegative going zero crossing.

Snap Zero - to +snaps picks to the nearest negative topositive going zero crossing.

Smooth Picks smooths the picks using a running aver-age filter.

Smooth Options... pops up a dialog box in which youcan enter the smoothing filter length.


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Customizing the User Interface

There are a number of features ofTrace Display that can becustomized using X Windows resources. The default resourcefile /advance/port/lib/X11/app-defaults/TraceDisplaycontains a sample set of resources. Note: The exact path ofthis file will depend on your installation. The resources inthis file are used to configure the screen size, colors, andfonts of various objects in Trace Display.

You must add a path to your XFILESEARCHPATHenvironment variable. A typical setting for this environmentvariable might be:

/advance/port/lib/X11/%T/%N%S:/usr/lib/X11/%T/%N%S

There are a number of ways to customize the resourcesettings:

Your system administrator can edit the default resourcefile.

You can copy the default resource file into your owndirectory, edit the file, and add that directory toXFILESEARCHPATH.

You can copy the default resource file to your $HOME

directory and edit it.

You can copy the resources into your .Xdefaults file, andadd the wordTraceDisplayto the beginning of eachresource name. For example, the default resource filecontains a line that looks like:

*geometry: 2000x2000

This line causes Trace Display to start up using the fullscreen. To start up using an 800 by 600 pixel window,

place the following line in your .Xdefaults file:

TraceDisplay*geometry: 800x600

For a more detailed discussion of customizing ProMAXapplications, please refer to theSystem Administrationguide.

trace display

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