Let’s say you’re perusing the 309,425 crash reports for automobile crashes in Chicago from 2007 to 2009 and you want to know a few things quickly.
Like how many REAR END crashes there were in January 2007 that had more than 1 injury in the report. With Google Refine, you could do that in about 60 seconds. You just need to know which “facets” to setup.
By the way, there are 90 crash reports meeting those criteria. Look at the screenshot below for how to set that up.
Facets to choose to filter the data
- Get your January facet
- Add your 2007 facet
- Select the collision type of “REAR END” facet
- Choose to include all the reports where injury is greater than 1 (click “include” next to each number higher than 1)
After we do this, we can quickly create a map using another Google tool, Fusion Tables.
Make a map
- Click Export… and select “Comma-separated value.” The file will download. (Make sure your latitude and longitude columns are called latitude and longitude instead of XCOORD and YCOORD or sometimes Fusion Tables will choke on the location and try to geocode your records, which is redundant.)
- Go to Google Fusion Tables and click New Table>Import Table and select your file.
- Give the new table a descriptive title, like “January 2007 rear end crashes with more than 1 injury”
- In the table view, click Visualize>Map.
I completed all the tasks on this page in under 5 minutes and then spent 5 more minutes writing this blog. “The power of Google.”