[kylerchin]

Expanded implementation

• Loads optional native OSM platform storage and constructs its spatial index from -p graph extracts.
• Matches GTFS stop locations against OSM platform node, way, and member geometry. Empty relation platforms cannot be matched because they have no extracted geometry.
• Ports MOTIS-style feature scoring for stop ID, numeric name/track, exact name, containing ID, platform code, public route tokens, way preference, non-ground-level preference, and geometric proximity.
• Validates elevated/non-ground platform matches using a reachable pedestrian OSR way at the matched level, limiting false snaps.
• Exposes a full metadata-aware match_platform FFI method alongside the earlier compatibility method.

Dependencies

Paired backend PR: catenarytransit/catenary-backend#145

Status and remaining verification

Draft; no native CXX build or SoCal real-graph test has completed in this environment. Matching behavior has been implemented from MOTIS sources but has not been verified as bit-for-bit equivalent to MOTIS. OSM relation matching depends on geometry being retained in native platform_ref_. Investigate using original MOTIS get_match as shared native code if API-stable identity is required.

Verification

Compile with pinned OSR revision and GCC 14, test on PBF extracted with -p, test elevated Expo/Sepulveda and alternate side-of-station placements, validate geometries and route-level access times for both directions, and benchmark many-to-one stop matching cost.