Functions

Point Cloud-based Distress Detection

Function Description: Based on geometric feature analysis of high-precision single-line laser point clouds, detects road distress areas. Supports 7 distress types: Rutting, Depression, Potholes, Bump, Swell, Corrugation, Shoving.

Operation Steps

1. Click the Point Cloud-based Distress Detection button to open the settings dialog
2. Select a lane line as the road line and set related parameters
3. Click OK to execute distress detection

Point Cloud-based Distress Detection

Output Results

• Vector Polygons: Stored in the "Distress" layer, recording each distress's type, severity level, area, length, width, height, and other information
• Point Cloud Additional Attributes: The height value of each distress point is written to the "DistressHeight" attribute; negative values indicate depressions, positive values indicate protrusions

Road Distress Rendering

Parameter Settings

Image-based Distress Detection

Function Description: Performs deep learning detection on images and maps results back to 3D space. Supports 6 distress types: Transverse Cracks, Longitudinal Cracks, Alligator Cracks, Potholes, Patching, Raveling.

Operation Steps

1. Click the Image-based Distress Detection button to open the settings dialog
2. Set detection type, model, camera and other parameters
3. Click Detect to execute distress detection

Image-based Distress Detection

Output Results

• Vector Polygons: Stored in the "Distress" layer, recording distress type, severity level, area, and other information
• Point Cloud Additional Attributes: Distress point height values written to "DistressHeight" attribute

Severity Level Classification (Longitudinal Cracks):

Parameter Settings

Distress Verification

Function Description: Performs manual verification on "Image-based Distress Detection" results, supporting delete, edit, and create operations.

Operation Steps

1. Click the Distress Verification button and set the maximum confidence parameter
2. Use "Previous"/"Next" to browse distresses pending verification
3. Use verification, delete, edit, create and other functions to process distresses

Verification Operations

During automatic jump, all three views (3D, Panoramic, Planar) synchronize and jump together.

Create Distress

1. Select distress type and severity level
2. Click in 3D/Panoramic/Planar view to determine polygon vertices
3. Double-click to close the polygon

Results are stored in the "Distress" layer, with length, width, and area properties automatically calculated.

Parameter Settings

• Maximum Confidence: Set the confidence threshold; only verify distresses below this value

Sample Unit Generator

Function Description: Sample units are the minimum unit for PCI calculation, used to define the pavement area and ensure that distresses outside the pavement do not participate in PCI calculation which would cause result deviation. Results are generated in the "Sample Unit" layer.

Operation Steps

1. Click the Sample Unit Generator button to open the settings dialog
2. Select generation mode (Automatic Mode or Fixed Width Mode)
3. Set corresponding parameters, click OK to generate sample units

Generation Modes

Parameter Settings

Automatic Mode

Fixed Width Mode

Round-trip trajectories are automatically deduplicated.

Sample Unit Editor

Function Description: Edit sample units generated in automatic mode to correct algorithm deviations.

Operation Steps

1. Click the Sample Unit Editor button to enter edit mode
2. Delete: Click to delete target sample unit
3. Create: Draw polygons on the pavement area to complete sample unit creation

Precautions

• It is recommended to confirm the accuracy of sample units before editing to avoid affecting PCI calculation results

PCI

Function Description: According to ASTM D6433-07 standard, calculate sample unit PCI using "Distress" layer data. Associate with trajectory or Road Center Line to obtain section PCI. Results are stored in the "PCI Section" layer as vector points.

Operation Steps

1. After distress detection and verification are complete, click the PCI button to open the settings dialog
2. Select data source and road line vector, set parameters
3. Click OK to execute PCI calculation

Parameter Settings

Only updates severity levels for the 7 listed types of distress; manually specified distress levels are not updated.

PCI Calculation Process

Based on ASTM D6433-07 standard:

1. Divide Sample Units: Divide the target area by set area (default 225㎡)
2. Count Distresses: Count total quantity by type and severity level, divided into three categories:
   • Count category: Potholes
   • Length category: Bumps, Edge Cracks, Reflection Cracks, Lane/Shoulder Drop-off, Longitudinal Cracks, Transverse Cracks
   • Area category: Alligator Cracks, Bleeding, Block Cracks, Corrugations, Depressions, Patches, Polished Aggregate, Railroad Crossings, Rutting, Shoving, Slippage Cracks, Swells, Weathering/Raveling
3. Calculate Percentage Density: Quantity ÷ Sample Unit Area × 100
4. Query Deduction Curve: Obtain individual deduction DV
5. Determine CDV: If only 0 or 1 deduction item > 2.0, then CDV is the sum of DVs; otherwise calculate as follows:
   • 5.1 Sort DVs in descending order
   • 5.2 Calculate allowable deduction items m = 1 + (9/98)×(100-HDV), where HDV is the maximum DV
   • 5.3 Calculate TDV for the first m items, count items > 2.0 as q, look up CDV from table
   • 5.4 Set the last item > 2.0 in the m-th item to 0, recalculate CDV
   • 5.5 Iterate until only one item > 2.0 remains, take the maximum CDV
6. Calculate PCI: PCI = 100 - CDV
7. Generate Section PCI: Associate with trajectory or Road Center Line; results stored in "PCI Section" layer

Export Report

Function Description: Generate reports based on "Distress" layer and "PCI Section" layer data.

Operation Steps

1. Click the Export Report button and select target road line
2. Set export path, click OK to export report

Report Content

1. Summary

One road line is one route; summarize selected routes.

Route List

Only point cloud-based distress detection automatically calculates fill and cut volumes; distresses obtained by other methods have fill and cut volumes of 0.

2. Route Details

Provide detailed distress distribution information in route order.

Section PCI Information: From "PCI Section" layer, containing association information between PCI sections and trajectory or Road Center Line.

PCI Section List

Distress Severity Level Statistics

Distress List