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Qimera Line Height Matching Tool

How to start

  • Height Matching Tool  option of the  Tools  menu in the  Main Menu  bar. 
  • Preexisting line and geographic selections will be used, but are not required.

What it does

The Height Matching Tool can work to vertically match unlocked lines, via an automated process, to neighboring lines that are either locked or have had an offset determined during the execution of the routine. It will resolve the offsets of all unlocked items using a Least Squares optimization, until all unlocked lines have been shifted. All locked lines will be considered, even if they are separate from each other geographically. The offset value between lines is calculated via footprints from each file that fall into common comparison cells.

The tool can also be used manually where, after double clicking in the Offset column for an unlocked line, a shift can be manually entered or changed with the mouse wheel.

Applied shift values, once saved, can be enabled, disabled, or reviewed in the Vertical Referencing tab of the Qimera Processing Settings Dialog.

General Description

Height Matching Main Application Window

The Height Matching Tool is meant to work in conjunction with the Qimera 4D Scene in the main Qimera application window. This is where the user selects appropriate spatial subsets of data to examine for the purposes of height matching. 

Height Matching Selection Area

The selection area for the plot test is automatically configured on startup.   It behaves just like the standard Rectangular Selection so you can use the handles to move or modify the shape.  You can also use one of the movement shortcut keys (W, S, A, D) to move the selection to a new location.  You can also use the Selection Dimensions Toolbar to more specifically control the size of the selection.  The Selection Movement Toolbar is also available to move the selection but only the forward/back buttons are enabled.

Height Matching Plot Dock

This window displays the view of the soundings in the area selected.  The selected area in the scene has an arrow that depicts the "view direction" of the soundings.  These are then projected onto the plotting surface.  As you move the Control Window offsets, the soundings are automatically shifted and their new position appears in the Plot Window.  This window behaves like all the other plotting windows with Qimera.  For more information on navigation within a plotting window, see the page on Qimera Plotting Surfaces.


The toolbar at the top of the window controls the view of the plot. 

  Explore Mode

This is the primary exploration mode of the tool.  As you move your cursor over the plot, the label in the lower left of the window will update to show the current value.

  Zoom Mode

When in zoom mode, simply click and drag an area of the plot to zoom into.  Or hit the Home button to return to the full extents of the data.  At any time, you can Shift-Click to drag the plot to a new location or use the middle mouse button.  This is especially useful when you are zoomed in.  You can always undo an edit using the Undo button.

  Reset Zoom

If you have zoomed into an area of the plot, this button will zoom out to the extents of the currently viewed attribute.

 Point Size

Clicking this button will incrementally change the size of the points and lines in your plot areas.  If you click and hold the button, it will display a menu where you can select point sizes between Small and XX-Large.

 Color By

This button group changes the "color by" options of the soundings in the plot.  Certain options will enable the color map button that allows selection or editing of color maps or the selection of a solid color.

Dock Options Menu

The view options allow you to configure what you see and how you see it in the sounding plot:

Show Grid Lines

Show/Hide the grid lines in your plot surfaces.

Save to Image...

Saves the plot area to an image file (JPEG or PNG).

Show Soundings

This sub-menu allows you to change the visibility of rejected, filtered, normal, additional, interpolated or user picked soundings.  Any changes to these options will be saved for the next time you perform height matching.

Height Matching Control Window

The control widget shows a table of the items that can be height matched.

There are four columns in the table:

  • Source Item - the source item name
  • Plot Color - the color that is used for correlating data in the plot, in the source tree, and in the scene
  • Locked - check-boxes for each item to lock their offset and prevent further adjustment
  • Offset - the currently applied offset, this can be double clicked to modify


The toolbar at the top of the window controls .


This button works the same as the Qimera Tools → Height Matching Tool menu option.  It will turn the height matching widgets on or off.


This button will save the new offsets for each line. The offset applies to the entire line, not just the data in the selection. It will remain greyed out until a change is made to one of the files' offsets.

 Auto Compute

This button will launch the Auto Compute routine.  This is the routine that automatically computes the offsets for the unlocked lines.

Lock All

This will lock all items. One or more items should be unlocked to use Auto Compute.

 Unlock All

This will unlock all items.  This is handy after resetting all offsets to zero, for example.

Dock Options Menu

Same behavior as the button on the toolbar.

Revert All Offsets Changes

This will reset all offsets to the last save.  You will be asked to verify this decision as you will lose all of your work.

Zero All Offsets

This will set all offsets to zero.