Road Graph Tiling for Accurate Mapping of Overlapping Roads
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Solution Overview
Problem
Existing methods for generating road graphs from a plurality of points in a region of interest are labor-intensive, time-consuming, resource-intensive, and inaccurate, particularly when dealing with overlapping or stacked roads.
Innovation Solution
A system that partitions a region of interest into overlapping tiles, generates a frame graph within each tile based on associated points, and combines these graphs to form a complete road graph, using a processor and memory to execute machine-readable instructions for efficient road graph generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to process point maps into road graphs, then the processing can be done, but it is labor and resource intensive and inaccurate
Solution Approach 1:
The patent divides the region of interest into multiple overlapping tiles, where each tile is processed independently to generate a frame graph. This segmentation allows parallel processing of multiple regions simultaneously, reducing overall computational burden while maintaining accuracy through the overlapping regions that capture road segments spanning multiple tiles.
Solution Approach 2:
The patent introduces a hierarchical processing dimension by first creating frame graphs at the tile level, then combining these into a complete road graph. This multi-level approach transforms the processing from a single complex operation into multiple simpler operations that can be executed in parallel and then merged.
2Loss of information
If the region of interest includes multiple roads side-by-side or stacked, then more road information is captured, but it becomes difficult to determine topology and geometry
Solution Approach 1:
The patent applies different processing treatments to different regions within tiles by creating inner and outer areas with corresponding borders. Points in inner areas are processed differently than points in outer areas, allowing the system to handle complex road configurations locally while maintaining overall consistency through the frame graph construction that considers spatial relationships.
3Reliability
If overlapping tiles are used to capture complete road segments, then road continuity is improved, but processing complexity increases
Solution Approach 1:
The patent merges frame graphs from multiple overlapping tiles by combining portions of road graphs from inner areas and integrating points from outer areas. This merging process consolidates redundant information from overlapping regions while preserving complete road segments that may span multiple tiles, achieving reliability through systematic integration.
Data Source
AI summary
Systems, methods, and other embodiments described herein relate to generating, in a scalable manner, a road graph from points in a region of interest. In one embodiment, a method includes partitioning the region of interest into tiles. Each tile has an inner area and an outer area. Each tile has an inner border encapsulating the inner area and separating the inner area from the outer area and an outer border encapsulating the outer area. The tiles overlap neighboring tiles. The method includes generating a portion of a frame graph for each tile based on the points associated with each tile. The method includes generating a portion of a road graph based on the portion of frame graph within each tile and combining the portion of the road graph in the inner area into the road graph based on the points in the outer area of each tile.