3D Road Element Labeling Across Segmented Road Surfaces

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In three-dimensional maps, road elements are often drawn in a plane manner, leading to issues such as partial hiding or distortion when adjacent triangular patches have different elevations, resulting in poor labeling and fit issues.

Innovation Solution

A method and apparatus for labeling road elements by segmenting roads into multiple plane-based segments and using joint points to divide road elements across these segments, ensuring they are labeled correctly on different planes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If road elements are drawn in a plane manner on three-dimensional map, then the labeling process is simple, but the road elements do not fit the road and may be overlaid or distorted when adjacent triangular patches have different elevations

Engineering Contradiction:

Improvelabeling process simplicityVSAvoidroad element fit accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The road is segmented into multiple road segments based on triangular patches, and road elements spanning boundary lines are divided into multiple sections at joint points. Each section is drawn on the corresponding road segment plane, ensuring fit accuracy while maintaining manageable labeling complexity through structured division.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If road elements are drawn across boundary lines of adjacent road segments, then the road elements maintain continuity, but the elements may be overlaid by the road when patches have different elevations

Engineering Contradiction:

Improveroad element continuityVSAvoidroad element overlay and distortion

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

Road elements spanning boundary lines are segmented into multiple sections at joint points located on boundary lines. Each section is drawn separately on its corresponding road segment, preventing overlay while maintaining visual continuity through proper positioning and connection at the joint points.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of road elements are drawn with local adaptation to their respective road segment planes. Each section's positioning and orientation are optimized for its local context, ensuring it fits the specific road geometry and elevation of that segment while maintaining overall element continuity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12586318B2Method and apparatus for labeling road element, device, and storage medium

Publication Date: 2026.03.24 TENCENT TECHNOLOGY (SHENZHEN) CO LTD

AI summary

A method for labeling a road element includes: obtaining a sequence of road geometry line points of a first road in a three-dimensional map, the sequence of road geometry line points including a plurality of location points for drawing an outline of a road geometry of the first road; segmenting the first road based on the sequence of road geometry line points, to obtain a plurality of road segments of the first road, a road surface of a road segment being drawn as a plane; and determining, in response to that a target road element spans a boundary line of two adjacent road segments in the first road, a joint point located on the boundary line, the joint point being configured as a label to divide the target road element to two sections that are respectively placed on the road surfaces of the two adjacent road segments.