Dynamic Map Label Placement via Deconfliction Groups
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Solution Overview
Problem
Conventional digital mapping techniques fail to effectively handle overlapping map labels, leading to information loss and performance issues, especially in applications like aeronautical charts where all labels must be shown, as they either delete labels or require costly preprocessing.
Innovation Solution
The method employs deconfliction groups, specialized placement search algorithms, and cell-based weighting to prioritize label placement, allowing overlap while minimizing it, using an Overlap Manager to manage label conflicts and assign weights based on importance, ensuring all labels are displayed without significant performance impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional preprocessing techniques (conflict graph building) are used to handle label conflicts, then label placement accuracy improves, but computational performance deteriorates significantly
Solution Approach 1:
The patent divides the map area into multiple tiles and processes label placement independently for each tile. This segmentation allows parallel processing of different regions, reducing overall computational time while maintaining placement accuracy within each tile context.
Solution Approach 2:
The patent performs preliminary actions by pre-calculating and storing label placement preferences, visibility weights, and conflict resolution rules in data structures before actual label placement. This preprocessing of rules (not full conflict graphs) enables fast runtime decision-making without expensive graph construction.
2Ease of operation
If labels are deleted or ignored when overlapping occurs, then map clutter is reduced, but information completeness deteriorates
Solution Approach 1:
The patent changes parameters by adjusting label transparency, size, and positioning dynamically based on conflict severity and label importance weights. Instead of binary show/hide decisions, it varies visual parameters to maintain information display while managing clutter through subtle visual adjustments.
Solution Approach 2:
The patent resolves two-dimensional label conflicts by moving labels into the third dimension (vertical layering) through adjusted positioning and transparency. Labels are placed at different visual depths and with varying opacity levels, allowing multiple labels to coexist without complete occlusion, thus preserving information while managing visual clutter.
3Loss of information
If all labels are displayed on the map, then information completeness improves, but visual clutter increases
Solution Approach 1:
The patent introduces an intermediary evaluation system that calculates visibility weights and conflict scores for each label based on multiple factors (importance, user preferences, spatial relationships). This intermediary computation layer mediates between the goal of showing all labels and the need to reduce clutter, producing optimized placement decisions that balance both objectives.
4Adaptability or versatility
If dynamic label placement is implemented, then adaptability to different map views improves, but computational complexity increases
Solution Approach 1:
The patent implements dynamics by making label placement fully adaptive to current map view, zoom level, and user preferences. The system recalculates optimal positions based on dynamic parameters such as visible area, label importance weights, and detected conflicts, allowing the placement to evolve with changing map conditions rather than using static pre-computed positions.
Data Source
AI summary
Systems and methods are provided for label placement that provide necessary information on a map when map features conflict without significantly impacting performance. Embodiments of the present disclosure can handle placement of map labels that vary in size, have prioritized label/feature groupings, apply to point, line, and area features, minimize overlap when there is no more open space, and render fast enough for interactive viewing.