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Combining disparate network graphs, such as road networks and transit schedules, into a single traversable structure.
Distinct from Multi-Modal Preprocessing Pipelines: Candidates focus on AI multi-modal data (text/image); this is about transport network graphs.
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Valhalla is an open-source routing engine that calculates optimal paths and travel times using OpenStreetMap data. It is built around a tiled routing graph framework, allowing map data to be organized into small geographic tiles for efficient regional updates and offline routing capability. The project distinguishes itself through a multimodal routing server that combines automobile, pedestrian, bicycle, and public transit modes into single journeys. It includes a GPS trace matching engine to align noisy coordinates to the most probable road network paths and an isochrone and matrix generator
Combines road networks with GTFS transit feeds to calculate journeys involving multiple transport modes.