MEGS_Log settings

MEGS_Log settings that can be changed from within the program are listed below.

Display related settings

Scale

The Scale setting affects the scale of the borehole for both the screen display and for printing. For example, a scale of 1:200 means that one millimetre on the screen will be equivalent to 200 millimetres in the borehole.

You can change the scale by:

• Using the 'I' and 'O' shortcut keys (for zoom in and zoom out respectively) from within the main MEGS_Log window. These keys move the scale through a set of predefined steps: 1:10, 1:20, 1:50, 1:100, and so on.
• Using the View tab of the Options dialog box.
• Using the Scale command under the View menu or the Set Scale commands under the Trace and Borehole popup menus.
• Clicking the Scale toolbar icon ().

The accuracy of the scaling depends on the video and printer hardware and drivers.

Depth Tolerance

The Depth Tolerance affects the rounding of depths and the resolution or granularity of changes to unit boundaries when using the mouse. For example, if the depth tolerance is 0.01 metres, then all depths set by using the mouse will always be a multiple of 0.01 metres.

Only a limited set of Depth Tolerances are available - in metres: 0.001, 0.002, 0.005, 0.01, 0.02, etc, through to 1.0.

The Depth Tolerance is also used to position the Ruler and round the depth of the mouse cursor reported at the bottom of each borehole.

When the Scale is low relative to the depth tolerance you may see a boundary between units, the ruler or the depth shown at the bottom of each borehole jump as the mouse moves.

The Depth Tolerance can be changed using the View tab of the Options dialog box.

Ruler

The Ruler setting controls whether MEGS_Log tracks the mouse cursor with a thin blue horizontal line across the right hand pane of the main MEGS_Log window.

You can use the ruler to help accurately align unit boundaries with changes in the geophysical traces.

The ruler is not shown when the vertical position of the mouse is above the top or below the bottom of the borehole fields.

You can change the Ruler setting by:

• Selecting the Ruler command under the View menu (acts as a toggle).
• Clicking the Ruler toolbar icon ().
• Using the View tab of the Options dialog box.

Fine Scroll

The Fine Scroll setting controls the increment that MEGS_Log scrolls the display when you use the up and down scroll bar buttons or the Ctrl-Up and Ctrl-Down shortcut keys or the scroll wheel on the mouse.

The Fine Scroll setting does not affect scrolling when you use the scroll bar thumb, or the Page Up and Page Down shortcut keys.

You can change the Fine Scroll setting by:

• Using the Ctrl-F shortcut key (acts as a toggle).
• Selecting the Fine Scroll command under the View menu.
• Clicking the Fine Scroll toolbar icon ()
• Using the View tab of the Options dialog box.

Depth Display Precision

The Depth Display Precision controls the number of decimal places that MEGS_Log displays for the depth labels to the left of each bore and trace field, and the Current Depth and Display Top depth shown at the bottom of the MEGS_Log display. In the case of the depth labels, this applies for both display on a monitor and for printing. This setting also affects the number of decimal places used to format depths in many of the MEGS_Log dialog boxes.

You should ensure that the Depth Display Precision is sufficient to represent all depths using the current Depth Tolerance - ie. if the Depth Tolerance is 0.01 metres, then use a Depth Display Precision of two or more.

You can change the Depth Display Precision by using the View tab of the Options dialog box.

Trace Range Display Precision

The Trace Range Display Precision controls the number of decimal places that MEGS_Log displays for the minimum and maximum range labels underneath each trace field. This applies both for display on a monitor and for printing.

You can change the Trace Range Display Precision by using the View tab of the Options dialog box.

Link Scrollbars

If the Link Scrollbars setting is on then movement of the right scrollbar also shifts the left scrollbar by the same depth, otherwise the scrollbars move independently.

You can change the Link Scrollbars setting by selecting the Link Scrollbars command under the View menu or the Link Scrollbars toolbar icon (). If the setting is on a check mark is displayed next to the menu item and the toolbar icon is shown selected.

Filter Traces

If the Filter Traces setting is on then a filter is applied to all geophysical traces prior to display. Filter settings can be controlled for each trace using the Trace Manager dialog box.

You can change the Filter Traces setting by selecting the Filter Traces command under the View menu or the Filter Traces toolbar icon (). If the setting is on a check mark is displayed next to the menu item and the toolbar icon is shown selected.

Show Sample Numbers

If the Show Sample Numbers setting is on then the sample number for each interval is displayed in the annotation area to the right of each borehole, otherwise the seam and ply assigned to each interval is shown.

This also affects the behaviour of the Correlate Edit Mode - with sample numbers showing this tool edits the sample number otherwise it edits the seam and ply.

You can change the Show Sample Numbers setting by selecting the Sample Numbers command under the View menu or the Show Sample Numbers toolbar icon (). When the setting is on a check mark is displayed next to the menu item and the toolbar icon is shown selected.

Settings relating to Fonts

The same fonts are used for display and for printing. All font settings can be changed using the Fonts tab of the Options dialog box.

General text

This font is used to draw the borehole name at the top of the display and the depth labels at the bottom of the display.

The height of this font also affects the vertical spacing of many elements of the MEGS_Log display, such as the distance from the bottom of each field to the bottom of the MEGS_Log main window.

Depths and annotations

This font is used to draw:

• the depth indications down the left hand side of each borehole and trace field;
• annotations, such as seam/ply names and sample numbers, displayed to the right of each borehole;
• geophysical trace labels, at the bottom of each trace field.

Print titles

This font is used for the text in the title block on print-outs. It is not used on the normal display.

General project settings

Site

The Site setting determines the set of seam and ply names that is available when assigning a seam or ply name to a unit.

You can change the Site setting by using the Project tab of the Options dialog box.

Configuration of sites and their associated seam and ply names is carried out using the MEGS_Log config file.

Project Name

The Project Name setting can (optionally) be displayed in the title block on print-outs of borehole data.

You can change the Project Name setting using the Project tab of the Options dialog box.

Hatch List

The Hatch List setting determines which set of hatches (patterns) is used when drawing a borehole, and the names of the rock types that are available when changing the rock type of a unit.

You can change the Hatch List setting using the Project tab of the Options dialog box.

Configuration of the hatch lists and their associated rock types is carried out using the MEGS_Log config file.

Default Schema

The Default Schema setting is the name of the schema to use for new boreholes within MEGS_Log. If the Always Ask setting is on, then the user is asked everytime a new borehole is created using the New Borehole command under the File menu .

Note that separate default schema names are maintained for opening and saving borehole files.

You can change the Default Schema setting using the Project tab of the Options dialog box.

Always Ask

The Always Ask setting determines whether the user will be prompted every time a new borehole is created for the schema to use. If this setting is off and the current Default Schema is a valid schema name then the Default Schema is used without asking the user.

You can change the Always Ask setting using the Project tab of the Options dialog box.