# Algorithmic Analysis of GTFS-RT vehicle position accuracy

**Authors:** Joshua Wong  
**arXiv:** [2506.06479](https://arxiv.org/abs/2506.06479)  
**Date:** 2025-06-06  
**Summary page:** https://www.summarizepaper.com/fr/arxiv-id/2506.06479v1/

## Abstract

This paper presents three novel algorithms for calculating geodesic intersections on an ellipsoid. These algorithms are applied in a case study analyzing real-time transit data in California to assess vehicle position drift. The analysis reveals that while certain data anomalies can be corrected, large-scale discrepancies persist. The paper concludes by proposing a set of practical solutions that can be implemented by either data producers or consumers to significantly improve positional accuracy.