anthrax3 / city-roads

Visualization of all roads within any city

city-roads

Render every single road in any city at once: https://anvaka.github.io/city-roads/

How it is made?

The data is fetched from OpenStreetMap using overpass API. While that API is free (as long as you follow ODbL licenses), it can be rate-limited and sometimes it is slow. After all we are downloading thousands of roads within an area!

To improve the performance of download, I indexed ~3,000 cities with population larger than 100,000 people and stored into a very simple protobuf format. The cities are stored into a cache in this github repository.

The name resolution is done by nominatim - for any query that you type into the search box it returns list of area ids. I check for the area id in my list of cached cities first, and fallback to overpass if area is not present in cache.

Limitations

The rendering of the city is limited by the browser and video card memory capacity. I was able to render Seattle roads without a hiccup on a very old samsung phone, though when I tried Tokyo (with 1.4m segments) the phone was very slow.

Selecting area that has millions of roads (e.g. a Washington state) may cause the page to crash even on a powerful device.

Luckily, most of the cities can be rendered without problems, resulting in a beautiful art.

Support

If you like this work and want to use it in your projects - you are more than welcome to do so!

Please let me know how it goes. You can also sponsor my projects here - your funds will be dedicated to more awesome and free data visualizations.

Local development

# install dependencies
npm install

# serve with hot reload at localhost:8080
npm run dev

# build for production with minification
npm run build

# build for production and view the bundle analyzer report
npm run build --report

License

The source code is licensed under MIT license