Check break lines - MDT25

3.16 Check Break Lines

Break lines are very useful to define relief effects. However, it is essential to have a tool available to check such lines. This command has therefore been implemented, which enables errors to be detected by drawing a series of marks on specific layers. The different error detection possibilities that can be activated in the dialog box designed for this purpose are described below:

Detect Loose Vertices: Determines polyline vertices in which there are no surveying points. The marks are represented on the ERROR_VERTICES layer.

Detect Points on Line: Finds the surveying points closest to polylines considered as break lines, and which should possibly be its vertex. They are drawn on the ERROR_POINTS layer.

Detect Crosses: Examines the crossings between break lines, which could possibly be due to an interpretation fault. The errors are drawn on the ERROR_CROSSES layer.

Check 3D Polylines: Checks whether there is a height difference between surveying points and polyline vertices.

Check Surfaces: Determines whether the break lines are included on the current surface. If there is an error, it is represented on the ERROR_SUP layer.

The Radius parameter defines the circumference used to mark possible errors on the drawing. Clean Error from Layers deletes all objects from the layers used to mark the errors.

The Layers button allows one to select the layers to be checked for possible errors.

Once the faults in the break lines that could considerably distort the digital terrain model have been detected, they can be checked either manually by creating a layer on which the errors are displayed or automatically by generating points where the error has been detected, activating error marks or creating points, respectively.

Possible faults are checked manually using the following toolbar:

These buttons allow one to zoom in on the area surrounding the errors. Once the error has been corrected, the circle marking it has to be deleted to enable the next one to be found when the toolbar button is clicked again. If there are no further errors, the toolbar disappears. The location margin can be modified by clicking the fifth button, and similarly the last button allows the Check Break Lines window to be displayed once again.