Live

CollisionViz is a data visualization web app for motor vehicle collisions in New York City. It is built with

• React.js
• SASS
• Google Maps JavaScript API
• Google Charts
• NYPD Motor Vehicle Collisions API

1. Select the date. The app will load all the collisions on that day from NYPD API, and show a time distribution chart and a heatmap.
2. The app also shows markers for collisions that happened during 8AM-9AM. Click on the chart to change the hour. Click on a marker for collision details.

1. npm install: installs node_modules and also builds development version of bundle.js and main.css, which can also be generated with npx webpack and npx sass src/scss/main.scss main.css
2. NODE_ENV=production npx webpack: builds production / minified version of bundle.js
3. npm start: webpack watches jsx file changes
4. Open index.html in browser to see the app.
5. npm audit fix to fix security issues in node modules.

• 8/2/2020: updated dependencies
• 3/16/2020: major update
  • Add
    • adaptors for third party APIs
  • Change
    • reorganize files and directories
  • Remove - less is more
    • play/pause mechanism
    • custom crash icons
    • map layers
    • Redux

• get date and time from URL query params
• use GitHub Actions to run npm start whenever master branch is updated, so that bundle.js does not have to be in this repo.