| OpendTect User Documentation version 4.2 |
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Inline, Crossline and Z-slice elements can be added into the tree by clicking on the element name and selecting Add/Add default data/Add color blended from the pop-up menu. This will insert an inline/crossline/Z-slice with a blank attribute, in the middle of the survey. This blank attribute can be displayed in the scene by reading stored seismic data (see below). When the mouse pointer is placed on a Stored Cubes sub-menu , a list of stored seismic volumes will be displayed.
Pre-stack stored cubes will appear in the list surrounded by curly brackets {}. They can be displayed on the slices of the 3D scene as common offset volumes, similarly to the components of (see multi-components volumes). The prefix "O=" is then presented with the offset value in XY units (meter or feet). Attributes may be computed on common offset volumes like for components or multi-component volumes.
Any desired cube can be selected from the list. The selected cube will be added as an attribute for the displayed inline number. The added attribute can also be replaced at any time by right-clicking on it (see the figure below).
Note: The check-boxes are used to show/hide the corresponding sub-element of inline/crossline/Z-slice.
After an attribute is displayed in the scene, it can be manipulated further by right-clicking over it (see figure below). The explanation for this list is described at the end of this section.
The attribute pop-up list menu.
Pop-up List Menu
Each individual element (Inline/Crossline/Z-slice) has a similar pop-up list menu (see below). There are two different ways to open this list. Either display it from the Tree (as shown below) or display it in the scene. In the latter case, place the mouse over the inline/crossline/Z-slice and right-click to launch the tree. This menu list has several functions that are described in following text.
An Inline pop-up list menu.
Add attribute: Add an additional blank attribute for the corresponding inline/crossline/Z-slice number. The attribute data (stored cubes or the attribute definition) can be displayed by right-clicking on it and selecting the desired attribute. Up to eight different attributes can be displayed within one element (inline, crossline, Z-slice).
Add Volume processing attribute: This option will add the volume processing attribute
Add HorizonCube display: This will display the HorizonCube
Add System tracts display: This adds system tracts
Show Histogram: The histograms of all added attributes of an element can be displayed using the right-click option of the parent element (inline number, surface name...). It is a useful tool to clip the ranges of an attribute by using vertical green lines in the histogram: The vertical green lines show the current amplitude range and can be moved left or right using the left mouse-click. The display is updated when the mouse click is released. This is performed independently for each attribute. Please note that this will toggle off the automatic clipping.
A multi-histogram display for an inline containing two attributes (Seismic and Acoustic impedance).
Position: Change an inline/crossline/Z-slice number. This option is used to manipulate (sub-select a range of traces/time) a line or to quickly scroll through the data for visualization.
Manipulate or scroll the inline |
Manual Scroll |
Auto Scroll |
By pressing the Scroll button, elements are moved either manually (select Control Manual), or automatically (select Control Auto). Scroll in the inline/crossline direction by specifying a fixed Scroll step. In the manual mode, the line/Z-slice is stepped to the new position after each subsequent click on the Advance button. In the automatic mode, the line/Z-slice is updated in a movie-style with a fixed time interval (in seconds) - Time between updates. The auto-scrolling can be paused by pressing the Pause button. To resume the auto-scrolling again press Go button.
Gridlines: Enables displaying grid lines on the particular element.
A new menu appears where the grid line spacing, style, color and width can be set.
Duplicate: Add a new duplicate/copy of a selected element in the tree.
Reset Manipulation: Reset changes made in the position of the line/Z-slice. Restore the original configuration.
Properties: Access display parameters; Transparency, Ambience/diffuse relflection, texture and mouse movement (scroll and pan settings).
Resolution: Edit the graphical resolution of the element. The Default does not involve any rescaling before the data is sent to the graphic card. The options Moderate and High do some pre-interpolation before the data is sent to the graphic card and generally results in a cleaner picture. If the memory of your graphic card does not allow high resolution, the element becomes black.
Note that if Shading is on, the resolution option is not available anymore(except for the horizon element).
Correlate with wells: This will correlate the line with 2D well
Display PS Gather: Pop-up a pre-stack viewer perpendicular to the inline or crossline.
Please note that it is also possible to display the offset of each CDP gather similarly to any post-stack data. The pre-stack data is available in the list of stored cubes and is marked with quotes { }, at the end of the list.
Lock / Unlock: Lock the selected object. Prevents accidental removing, moving or displaying data on the object. After clicking Unlock, all editing is again enabled.
Remove: This removes the element from the OpendTect tree and the graphics area.
The options available for attribute pop-up menu list are briefly described here:
Select attribute: When selected, data can be displayed from stored cubes or an attribute from the current attribute set (if available). To display an attribute, select or create an attribute set first.
Save Color Settings: Save color settings for a specific stored volume and make them available for future use.
Move: Move the attribute up, down, to top of the list, or to bottom of the list.
Show Histogram: Display data statistics (selected attribute) of the defined volume as a histogram in a pop up window.
Show Amplitude Spectrum: Amplitude vs frequency plot will be shown in pop up window.
Change transparency: Change the transparency of the attribute item to view one or more overlaying attributes simultaneously.
Display in a 2D Viewer as: Display an attribute in the 2D viewer as "Wiggle" or "VD" (Variable Density). For more details, please refer to: 2D viewer
Remove: Removes the attribute item from the tree.
