Calculation Options¶

Use this dialog to edit parameters that directly affect surveying calculations.

Where do I find the dialog?¶

Select the surveying application layer in the vertical list, right-click (or double-click), and choose Properties.... Then go to the Calculation Options tab.

Main Parameters¶

Refraction Coefficient¶

This value is used if you have selected Fetch from calculation options in the correction code dialog, for example, code 0. The typical value is 0.13–0.20, but it can vary significantly.

Average Height for Distance Reduction¶

If the points lack height, this value is used when reducing distances (to the ellipsoid).

Assumed Standard Deviation of the Weight Unit¶

The size of this parameter does not affect the adjustment result (coordinate values). It is used to scale the weights in the calculation.

Adjustment Options¶

Allow Use of Scale as Additional Unknown¶

If you check this box, you will have the option to use scale as an additional unknown in the adjustment calculation.

Use Observations Between Known Points¶

If you want to include observations between known points, for example, if you have measured a network of points, check this option.

Adjustment Stop Criteria¶

An adjustment stops either when the coordinate values do not change more than the specified value, or when the specified number of iterations has been run.

Number of Iterations¶

In an adjustment, corrections are calculated and applied to the preliminary coordinate values before the calculation process repeats. Such a calculation process is called an iteration.

Coordinate Change¶

Specified in meters.

Height Change¶

Specified in meters.

Presentation Settings¶

Number of Decimals¶

Here you can choose how many decimals you want to display for north, east, height, angle, distance, and other values.

Note

The calculation uses up to 14 decimals, but not all are displayed in the program.

Scale Factor for Ellipses¶

Used to present an adjustment graphically. In general, the error ellipse is shown at 1:1, regardless of the map window scale. If the value is 1 (default), the error ellipse is shown at 1:1 on the screen.

Note

The maximum value for display as above is 10 cm. If the ellipse is larger than this, it is shown as a pink/violet circle with a radius of 10 cm on the screen.

Warning Limits for Contradictions¶

Threshold values for how poor the agreement can be between reduced measurements and those derived from preliminary coordinates before a message is displayed on the screen.

Warning

A message is never given in the first iteration. This is a signal that there are likely gross errors in the observations.