Breakline Tools

The section editing breakline tool is mainly for point cloud classification and section TIN editing, mainly to solve the problem of missing terrain features (such as ridges, rivers or other feature lines that want to be saved in TIN) caused by the direct construction of TIN from laser point clouds .

The breakline tool belongs to the section editing module. Activate the section editing module, click "Start Editing" on the menu bar, and execute the "TIN" to generate this function. The source of the breakline can be drawn by the user or imported externally.

Add Breakline

The user draws a breakline. Currently, there are mainly three ways to add breaklines: single breakline, closed area breakline (such as lake) and regional breakline between two lines (such as river).

Usage

(1) Click "Add BreakLine"in the menu bar, and a dialog box will pop up:

(2) Switch the type option to the type to be added;

(3) In the dialog box, click "Draw Polyline" or the toolbar to enable the drawing function, and draw a polyline on the triangle net (same as the vector editing module to draw a polyline, left click to add a point to the polyline, double click to end the drawing, right click to pop up a menu Choose to close and finish drawing);

(4) Click the "Select" button in the dialog box or toolbar to enable the selection function, and select the polyline corresponding to the type in the scene;

(5) Set the corresponding parameters and click the "Add" button in the dialog box to complete the addition.

Single break line

Mainly deal with ridges, roadsides and other types of breaklines. Select a polyline in the scene (only one can be selected at a time);

Parameters Settings

• Breakline type: Divided into two types: soft and hard. The result point of the soft breakline type is on the triangular network, and the result point of the hard breakline is on the polyline;
• Add to layer: The result of the breakline is saved to the corresponding layer;
• Unified elevation: Only effective below the hard break line. If unified elevation is activated, the result line will be projected to the specified elevation plane. The default is the elevation of the last point of the polyline, which can be set by manually inputting or clicking the "select point" button and or selecting the point model. Right-click to exit the point selection mode;

Closed area breakline

Such as the lake breakline. Select a closed polyline in the scene (only one can be selected at a time);

Parameters Settings

• Add to layer: The result of the breakline is saved to the corresponding layer;
• Initial category: The category of the point cloud in the area of the breakline to be processed, generally the network type or all selections;
• Target category: classify the point cloud within the selected breakline as the target category;
• Elevation setting: If the elevation setting is activated, the result line will be projected to the elevation plane, and the default is the elevation of the last point of the polyline. You can manually enter the setting or dick the "select point" button or select the point model to set it, right click can exit the point selection mode;

Two break line area

Such as the area between the two banks of a river. Select two non-closed polylines in the scene;

Parameters Settings

• Add to Layer: Set the layer where the breakline will be placed after adding.
• Source category: The source category of the point cloud corresponding to the breakline to be processed, generally the network type.
• Target category: Divide the point cloud within the range of the breakline into this setting category.
• Elevation setting: Whether to enable the elevation setting. If the elevation setting is enabled, the two polylines will be adjusted incrementally according to the start and end elevations. The default is the start elevation value of the first polyline drawn, which can be set manually or click the "select point" button or select the point model to set, right click to exit the point selection mode.
• Starting elevation value: Starting elevation.
• End elevation value: End elevation value.

Delete breakline

Delete the specified breakline in the scene. Click the "Select" button in the Add BreakLine dialog box or toolbar to enable the selection function, select a vector line in the scene, and click the "Delete” button in the toolbar to delete the vector line and related operations.

Import breaklines

Support for importing vector files. By activating the "Import Breakline"button, select the file to import, and select the polyline to add the breakline by adding the polyline function.