Last year, Chicago-based open data wranglers Open City set a high bar for open government data visualizations and transparency websites. Today, Open City launched a new civic Web app at CrimeInChicago.org, adding to their growing portfolio of projects.

Derek Eder, one of the co-founders of Open City, emailed in this morning to share news of Crime in Chicago. “The website offers an interactive data visualization of the 4.8 million crimes reported in Chicago over the last decade,” he wrote. “It lets citizens see crime trends around them, compare crime levels over the years and across city wards, and explore each ward’s homicides, robberies, assaults and dozens of other crimes.”

The site also includes an interesting wrinkle on creating value from open data: selling high quality print posters ranking the incidence of crime in Chicago’s 50 wards.

As Eder pointed out, CrimeInChicago.com is possible because the Emanuel administration and the Chicago Police Department (CPD) are now publishing a open data online that includes local crime trends. In 2012, working to open government in Chicago means developers collaborating with the city to give citizens more understanding of their city.

This post has been updated to reflect an error in the Web address given for the project, if not the link underneath it. As Open City co-founder Juan-Pablo Velez pointed out via email, chicagocrime.org is “Adrian’s Holovaty’s old project, the one that gave birth to Everyblock. You could maybe see this project as the spiritual successor of chicagocrime.org, one that focuses on crime trends instead of crime incidents, but we don’t own that domain.”