city-roads
Visualization of all roads within any city built using vue.
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.
Scripting
Behind simple UI software engineers would also find scripting capabilities. You can develop programs on top
of the city-roads. A few examples are available in city-script. Scene
API is documented here: https://github.com/anvaka/city-roads/blob/master/API.md
Please share your creations and do not hesitate to reach out if you have any questions.
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
