Profiles

The Profiles window graphs channels of a LineDB survey along one line, fiducial by fiducial. Open it with the Profiles button on the toolbar above the values in the Attribute Table.

The window follows the table: it shows the line the table is showing, so clicking another line in the table's list redraws every profile, and it closes when the table closes. Each layer has its own table and its own Profiles window.

To step through the survey without going back to the table, use the arrow buttons on the Profiles toolbar: First line, Previous line, Next line and Last line, in the order the table lists the lines. The table follows along. The line's name and number of fiducials are shown beside the buttons.

The panels, their profiles and every setting are saved with the project, so reopening the window for a layer shows it as it was last left. The table likewise comes back on the line it was last showing.

Panels and profiles

Profiles are drawn in panels stacked one above the other, all the same width. The window starts with one empty panel.

Press Channel in the strip beside a panel to add a channel to it, or right click the panel and choose Add channel.... A channel can be added to as many panels as you like. Text channels cannot be graphed.

An array channel -- an EM decay, a spectrum -- is graphed as one line per element. Adding one draws the elements its table graph shows. To draw a different run, click the profile's name in the strip, or right click its entry in the panel's legend, and change First element and Last element. Every element of an array profile shares one base and range, so the lines can be compared with each other.

The same menu chooses how the elements are coloured. Single colour draws every element in the profile's colour. Colour ramp colours each element from a ramp: a continuous ramp is spread evenly from the first element to the last, and a discrete ramp's colours are taken in order, starting again if the run is longer than the ramp. Reverse takes the ramp from its other end.

Clicking a profile's name in the strip, or right clicking its legend entry, also changes its colour and removes it.

The same menu chooses how the profile is drawn: tick Line graph to join its values with a line, Points to mark each value with a symbol, or both. One of them always stays ticked. With points on, choose the Symbol -- square, circle, diamond, triangle, cross or plus -- and its Size. Zoomed out so far that there are more values than pixels, only the lowest and highest value in each pixel column is marked.

Press Panel on the toolbar to add a panel below the others. Remove a panel with the cross at the top of its strip, or with Remove panel on its right click menu. The last panel cannot be removed. The same menu has Clear channels, which empties the panel, and Clear channels in all panels.

Hover over a panel to read the fiducial under the pointer and the value of every profile there. A faint line marks that fiducial on every panel.

Vertical scale

Each panel decides how its profiles share the vertical. Right click the panel to choose:

With both on, the panel has one ordinary axis with tick labels, and every profile is drawn against it. If every profile in the panel is on a log scale, that axis is a log axis. With either off, the axis has no labels: each profile fills the panel from its own base to its own top, and its lowest and highest values are listed under its name in the strip, in its colour.

Any profile can be drawn on a log scale: tick Log scale in its menu, opened from its name in the strip or its legend entry. Only positive values can be drawn on a log scale, so zero and negative values leave gaps, and the range listed in the strip is of the positive values. A panel that mixes log and linear profiles cannot share one axis, so it is drawn as though the two settings were not both on. Its log profiles then share scale and base only with each other, and its linear profiles only with each other.

Turning Same scale off alone stretches each profile to fill the panel, which is the way to compare the shapes of channels of very different size. Turning Same base off alone keeps the scale but slides each profile down to start from its own lowest value.

Zooming and panning

As the pointer moves over a panel, a vertical line marks the fiducial under it in every panel. If the layer is visible in the scene, a magenta square marks where that fiducial is on the highlighted line.

Panels cannot be zoomed vertically. A panel with an ordinary axis fits its axis to the values on screen as you pan.

With Link horizontal axes ticked, every panel shows the same stretch of the line and moves together. Untick it to zoom and pan each panel on its own. Each panel then shows where the others are: two vertical lines in a panel's colour mark the first and last fiducial that panel is showing. The panel's colour is the bar down its left edge and the swatch at the top of its strip, which you can click to change.

Marking a span

Drag with the left button across a panel to mark a span of fiducials. The span is shaded on every panel, and the same rows are shaded in the Attribute Table. Click a panel without dragging to clear it.

The span can also be marked in the table:

• Click a row number and drag down the # column.
• Click a cell, then hold Shift and click another to mark every row between them.
• Press Esc in the table to clear the span.

There is one span, shared by the table and every panel. Choosing another line clears it.