Section Analysis

Summary

The Section Analysis toolbar contains functions that can be used to: (1) extract points along a user-defined section line and (2) generate horizontal and vertical section views.

Usage

Import the point cloud data into the currently active window, click Terrain > Section Analysis, a section analysis toolbar will appear at the top of the data display window.

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Section Analysis Toolbar functions include (from left to right): Section Analysis Editor, Create Section Polyline, Import Section Polyline, Extract Points Along Section Line, Save Section Polyline, Generate Orthogonal Reference Lines, Save Reference Section Lines, Import Designed Cross Sections, Generate Road Cross Section Diagrams, Generate Tunnel Cross Section Diagrams, Show/Hide Vector Tools, Clear Tools, and Exit.

Navigate to and Click on Editor > Start Edit.

Select the target point cloud dataset loaded in the current active window to begin the Section Analysis.

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Generate Reference Section Line

Description: Create a reference section line by drawing a series of points with the mouse. This tool supports drawing multiple reference section lines.

Import Section Polyline

Brief: Open an existing section polyline file. LiDAR360 supports .txt and .dxf formatted polyline file type imports. The Import Polyline tool can read in section text information stored in .dxf file formats. Note: If there are more than two nodes of a section line, LiDAR360 will recognize the feature as a profile by default. Otherwise, the imported polyline feature will be recognized as a cross-section.

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Note: File format of an import text (.txt) file: X, Y, Z.

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Extract Points Along Section Line

Description: Click this button to extract the point cloud data file around the reference section line.

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Settings

-Section: Select the section line that needs to extract the point cloud.

-Buffer size (meters) (default is "1.00"): The buffer distance perpendicular to the reference section line. If set to 100 meters, the two ends on the left and right of the section line will be buffered by 50 meters.

Save Section Polyline

Brief: Save the created Section Polylines to a .txt or .shp formatted file. The format of the saved section polyline file should be consistent with the format of the section line imported from an external source.

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The file format of the saved section line will be consistent with the format of the section line imported from the external resource.

Generate Cross-Section Polyline

Brief: Generate section polylines that are orthogonal to a section centerline.

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Settings

  • Cross-Section Width: The length of the orthogonal section line. The default Cross-Section Width value is "100" meters.
  • Cross-Section Step Length: The Step Length of orthogonal cross-section lines. The default Step Length value is 100 meters.
  • Export Cross-Section Polylines: Save generated orthogonal cross-section polylines to a .txt or a .shp formatted file.
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Cross section map is shown here.

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Import Designed Cross Section

Description: Click this button to import the designed section into the software. Support text files (*.txt), the read section lines will all be displayed as design section lines. For the design section format, please refer to the "Import Reference Section Line" function.

Generate Road Section Chart

Description: Click this button to generate the section chart of a given road.

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Click and hold the left button of the mouse and move on the section chart, users can view the section information at the position of the mouse in real-time. In the figure below, the position of the red label of the point cloud on the left corresponds to the dark red label in the chart on the right. When you click the "Calculate" button, a parameter setting dialog box pops up.

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Settings

  • Section Thickness(m)(default value is "1"): Generate section view using point cloud data along the width of the section line.
  • From Class: Source class.
  • Section Step (m)(default value is "5"): The section will be simplified according to this value and the distance threshold. The section will use the linear interpolation to interpolate points at integer multiples of the step value. If the step value is set to 0, the entire section will be simplified.
  • Distance Threshold (m)(default value is "0.01"): The section will be simplified according to this parameter based on the Douglas algorithm. The larger this value is, the simpler the remaining section line will be. The larger this value is, the more points and details will remain.
  • Type: Generate section view using point cloud data of different elevation types.
    • Lower (default): Use the lower point of the section to generate a section view.
    • Upper: Use the upper point of the section to generate a section view.
  • Max Edge Length (m)(default value is "0"): The threshold of the maximum length of the segment lines, which needs to be used in conjunction with the Split Profile on Longer Edges. If the distance between two points in the section view is larger than the Max Edge Length, it will be disconnected into two segments. The default value is 0, which means no disconnection.
  • Split Profile on Longer Edges: Divide the Profile into multiple segments according to the length threshold of segment (Users need to consider the threshold of the maximum edge length).
    • Yes: Segment Profile into multiple segments based on the threshold of segment length.
    • No (default): Do not segment Profile into multiple segments based on the threshold of segment length.
  • Section Index: Select the profile displayed in the dialog to highlight it in the window.
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  • Export Sections: Save the currently generated section line(s) to one or multiple files, ASCII(.txt) file(s)、Vector(.shp) file(s) and DXF(.dxf) file(s) are supported. Export product format reference Section Product File Format
  • Export Picture: Save a screen shot of the current dialog section as a .pdf formatted image file. Users can set the resolution and dimensions of the exported section view in the export dialog.
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Generate Tunnel Section Chart

Description: Click this button to generate a tunnel section chart based on the cross sectional line.

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Click the Calculate button to pop up the parameter setting dialog box. Click OK to generate the tunnel cross-section. Canvas can be panned and zoomed with the mouse.

-tunnel section parameters: -Maximum side length (m) (default is "0.5"): Maximum line segment side length threshold, which needs to be used in conjunction with the split long side. With the split long side checked, if there are two points in the cross-sectional diagram If the distance between them is greater than this value, it will be broken into two segments. The default value is 0, which means no segmentation. -Cross-section thickness (m) (default is "0.5"): Generate cross-section maps using point cloud data along the width of the cross-section line. -Export Section: Save the currently generated tunnel section line, which can be saved as a 2D or 3D text file. -Export image: Save the current cross-sectional view of the dialog box as a picture, and the format can be saved as pdf. The user can set the resolution and size of the exported cross-sectional view in the export interface. -Edit concave point: Edit the node of the tunnel section line. After editing, you can drag the node. -Sections Comparison: Compare the generated reference section of the tunnel with the design section of the tunnel and calculate the amount of fill and cut. Fill and excavation are displayed in different colors (colors can be set). -Export Comparison Report: Users can export the cross-sectional view and cross-sectional information on the current canvas into a report, and output it to the specified folder. -Distance Measurement: After distance measurement is turned on, you can use the left mouse button to click on the canvas to pick up the points to be measured, and you can use the mouse to zoom and pan the canvas at the same time. Double-click the left mouse button to complete the measurement; click the "Distance Measurement" button again to end the measurement. -Settings: The setting dialog box will pop up. You can set the color of the point cloud and the color of the section nodes. -Show section properties: User can show/hide the current section properties.

Show or Hide Section Polylines

Brief: Show or hide section polylines as needed, including Draw Line, Orthogonal Line, Section Line and All.

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Clear Section Polylines

Brief: Clear all or some of the Section Polylines using this tool. Clearing options include: Clear Line, Clear Orthogonal Line, Clear Section Line, and Clear All.

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Exit

Brief: Exit Section Analysis.

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