Generation of a TIN following a reference line

Menu: Civil / Surfaces / Contour Tab and Menu: Analyse / Ground

In VisionLidar, ground detection and contour generation are fundamental processes for creating accurate triangulated surfaces (TINs). These tools allow users to extract ground points, generate surfaces, and refine contours to match specific project needs.

1. Ground Detection and Surface Creation

✔ Ground detection classifies points belonging to the terrain surface.
✔ Creates a triangulated surface (TIN) from detected ground points.
✔ Optional corridor-based surface generation for road, rail, and pipeline projects.

Steps to Generate a Triangulated Surface

🔹 Step 1: Open the Ground Detection Tool
Navigate to Menu: Analyse / Ground to begin processing.

🔹 Step 2: Configure Detection Parameters
✔ Enable Surface Creation → Check the "Create surface" option.
✔ Choose a Corridor Reference → Define a centerline alignment and set buffer zone offsets (left & right).
✔ Limit by Corridor → If unchecked, the software analyzes the entire point cloud.
✔ Adjust Algorithm Settings → Optimize filtering and classification to improve accuracy.

🔹 Step 3: Run the Detection Algorithm
✔ Click "Start" → The software classifies ground points and creates a TIN surface.
✔ The generated surface is added to the "Objects" tab in the Explorer.

2. Contour Modification for Corridor-Based Projects

✔ Corridor-based contour adjustment ensures surfaces match roadways, railways, and pipelines.
✔ Offsets define surface boundaries, aligning the contour with infrastructure requirements.

Steps to Modify a Surface Using a Corridor

🔹 Step 1: Open the Contour Tab
✔ Navigate to Menu: Civil / Surfaces / Contour Tab.
✔ Select the surface to be modified.

🔹 Step 2: Generate a Contour from a Corridor
✔ Right-click in the list of points and choose "Generate from corridor".
✔ Select an alignment from the list (road centerline, track, or pipeline path).
✔ Specify left and right offsets → Defines the new surface boundary.

🔹 Step 3: Apply and Save Changes
✔ The modified surface contour follows the selected corridor.
✔ Save the updated contour definition for future analysis.

3. Best Practices for Ground Detection and Contour Adjustment

✔ Use corridor limits for infrastructure projects → Avoid unnecessary ground classification outside the area of interest.
✔ Optimize ground detection parameters → Adjust tolerance values for better terrain accuracy.
✔ Check and refine contours after generation → Ensure alignment precision before finalizing the surface.
✔ Combine with breaklines for enhanced accuracy → Preserve natural and man-made features.