Levelling Control

Levelling is a method for finding the elevation difference between points. The method is based on horizontal sight lines and is described in more detail under Levelling Observations.

Traverse-like networks, elevation networks, and polygon traverses usually have quite weak geometry, which can make error detection within the adjustment difficult. Therefore, as much error detection as possible should be done before the adjustment calculation.

In addition to analysis of double measurements, this can be performed by calculating errors in loops and runs between known points. In loops, the error is the difference between start and end values, which theoretically should be identical. For runs, the error is defined as the deviation between the measurement result and the corresponding quantity calculated using the starting points.

Report

The report contains three sections:

• For all lines between junction points
• For the loops
• For double measurements

At the end of each section in the log file, you get an overview of accepted and rejected measurements according to the selected standard.

Graphical Display

In the map window, you get loop numbers and gaps plotted in meters.