A Novel Scalable Framework to Reconstruct Vehicular Trajectories From Unreliable GPS Datasets
Bibliographic record
Abstract
Vehicle trajectory data is paramount in many applications and research areas, such as vehicular networks and Intelligent Transportation Systems (ITS). However, data gathered from location acquisition devices generally contain positional errors that hinder its applicability, and therefore processing techniques are necessary to improve the quality of trajectory data. For instance, physical constraints of the road network that bounds the vehicles’ movement can be used to represent a trajectory better. Therefore, this paper proposes an efficient framework to reconstruct road-network constrained trajectories from GPS-based datasets. The framework employs novel processing algorithms and models to prepare even low sampled trajectories, which naturally present gaps, for real applications. Besides that, we present a novel real-world benchmark dataset to evaluate trajectory reconstruction and map-matching algorithms and perform extensive experimental evaluations using the new dataset and another one from the literature to compare the proposed framework to related work. The experimental results show that the proposed framework has a better time complexity and accuracy than the other methods in all evaluated scenarios.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.003 | 0.003 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".