Open Bike Map Seattle

A bike map for Seattle, built with large amounts of open data for better exploration and directions. Check it out at https://www.openbikemapseattle.com.

Note: This repository contains code generated by AI.

Features

See more infrastructure at a glance. Open Bike Map Seattle shows the following layers on the map:

• All ages & abilities routes, including neighborhood greenways
• Every public bike rack and bicycle wayfinding sign in the city
• Public restrooms, parks, and other points of interest
• Under construction routes and official city future plans

Ride comfortably and safely. Using city data and other sources, directions to your destination consider the following factors:

• The level of bike infrastructure
• How wide the roads are
• If protected crossings such as traffic signals are available
• How many turns are involved in the route
• Elevation, computed intelligently to recognize bridges and overpasses correctly

And more miscellaneous features.

• Works 100% offline
• Regular data updates will be available
• Sidewalk riding
• Customized profiles for your riding priorities

Data sources

Layer	Source
Bike facilities, multi-use trails, Bike+ Network, bike racks, wayfinding signs	SDOT Open Data
Traffic signals, stop signs, crosswalks, beacons, traffic circles	SDOT
Street centerlines, libraries, community centers, park restrooms	SDOT
Regional trails outside Seattle	King County GIS
Light rail stations	Sound Transit (via SDOT)
Street network, addresses, POIs	OpenStreetMap
Basemap tiles	Protomaps daily build
Elevation	USGS 3DEP 1/3 arc-second DTM

For developers

npm install
npm run dev      # http://localhost:5173

The shipped repo includes pre-built data (public/data/) and a Seattle PMTiles extract (public/tiles/), so the app runs out of the box.

To refresh the data from upstream sources:

python3 -m venv .venv && source .venv/bin/activate
pip install requests shapely numpy rasterio scipy scikit-image
python3 scripts/fetch_data.py            # SDOT / King County GeoJSON
python3 scripts/build_graph.py           # routing graph from OSM + SDOT joins
python3 scripts/sample_dtm.py            # USGS elevation per node + per edge
python3 scripts/resolve_elevation.py     # heat-eq smoothing over bridges/tunnels
python3 scripts/build_addr_index.py      # OSM addresses + POIs
python3 scripts/build_data_manifest.py   # PWA version manifest (always last)

To refresh the basemap from a recent Protomaps daily build:

brew install pmtiles
bash scripts/make_basemap.sh YYYYMMDD    # pick a date from build.protomaps.com

To build for deploy:

npm run build:pwa     # icons, fonts, data manifest
npm run build         # vite → dist/

vite.config.js uses base: './', so the build works under any GitHub Pages path.

Credits

Built on MapLibre GL JS, Protomaps, PMTiles, FlexSearch, and the work of OpenStreetMap, SDOT, King County GIS, and USGS. UI icons by Google Material Symbols.