Match a trace.
Keep no graph.

This page sends coordinates to a hidden browser endpoint. That service range-fetches Protomaps, performs the match, and returns render-ready JSON—without an application server.

1Draw

2Fetch

3Match

Matcher

0 observations

Search radius 70 m Candidates per point 6 Sequence-aware Penalize jumps, wrong-way travel, and U-turns Trim display edges Show only probe-relevant portions of selected roads Infill route gaps Route between matches on a temporary local graph

Add at least two observations or load the example.

What this proves—and what it does not

The demo proves sparse browser reads and local candidate matching work against an ordinary Protomaps archive. It uses declared one-way direction, but does not reconstruct full topology or turn restrictions. Dashed purple segments are shortest paths on a temporary graph inferred from nearby road geometry—not direct probe matches or guaranteed legal travel.

observations selected roads inferred route matched trace