routes

Hiking trails on OpenStreetMap are tagged haphazardly:

• most trails are not route=hiking relation
• many trails consist of multiple ways that need to be joined together
• the start/end points of trails are often not clear

This repo converts OSM's way/node data into a graph structure, and then tries to generate a canonicalized list of trails.

Input

Clone hikeratlas/basemap and run:

./export/export path-to-some-pbf.pbf ztrails

This will create a GeoJSONL file of paths, parking lots, lakes and peaks. This file can then be consumed by this project to emit trails.

Definitions

A trail is a continuous linestring. It may be closed, an out-and-back, or a lasso. It starts at a trailhead. It never doubles back when it could explore a new path. It never visits the same node more than twice.

A trailhead is a footpath that intersections a parking lot or highway.

Strategy

1. Enumerate trailheads.
2. For each trailhead, compute all valid trails from it.
3. Take the "best" trail. TBD how to define what is best.