关于OSRM Match服务适配公共交通及多模态路径的技术咨询

Hey Patrick, great questions as you dive into OSRM's Match service—let me break this down clearly for you:

You’re spot-on that out-of-the-box OSRM only includes car, bike, and foot profiles. The core reason here is that OSRM is built for road-based routing, and public transport (especially subways) operates on a totally different set of rules: dedicated tracks, timetables, station transfers, and non-road paths that OSRM doesn’t natively handle.

That said, there are two solid workarounds:

• Pair OSRM with a transit-focused tool: Start by using OSRM’s foot profile to match your GPS points to sidewalks or streets near transit stops. Then use a tool designed for public transit routing to fill in the subway/bus segments between those stops. This lets you leverage OSRM’s precise road matching while relying on a specialized tool for transit logic.
• Build a custom OSRM dataset for transit lines: If you only need to spatially match points to subway tracks (and don’t care about timetables or transfers), you can modify your OpenStreetMap (OSM) dataset to tag subway tracks as traversable "roads," then create a custom OSRM profile that allows matching to these tracks. Keep in mind this won’t handle scheduling—it just lets you match points to the physical transit network.

OSRM’s Match service doesn’t natively output multi-modal paths, but you can use timestamps to infer mode changes and combine results from different profiles to build a multi-modal route:

• Use timestamps to detect mode shifts: When you include timestamps with your GPS points, OSRM calculates the speed between consecutive points. You can use these speed values to spot mode changes (e.g., walking speed ~5km/h vs. subway speed ~30km/h vs. car speed ~60km/h).
• Run segmented matches with appropriate profiles: Once you’ve split your GPS data into segments based on inferred modes, run the Match service on each segment with the right profile (foot for walking, car for driving, etc.). Then stitch these segmented results together to create a full multi-modal path.
• Layer in transit logic for transit segments: For any subway/bus segments, you’ll still need to use a transit routing tool to get the actual route between stations—OSRM can’t handle timetable-based routing. The timestamps will help you align when the user was on transit vs. other modes.

内容的提问来源于stack exchange，提问作者Patrick