This is the latest installment in Christopher Groskopf's attempt to open up the data of the town in Texas to which he's moving. Read about the genesis of the project here.
Tyler Sirens (launch the app here) presents nearly-up-to-the-minute incident report data from Tyler Police Department. However, if it were just that it wouldn't be much different from the Tyler Morning Telegraph's Police Call Map. What Tyler Sirens adds is real-time updates. If you leave your window open and a report comes in (or is updated), the map will instantly update and display the newest information. It's less like looking at a map of what's happened and more like listening to a police scanner. (For the geeks out there, this is built on Pusher. Oh, and there is an API. And, of course, it's open source.)
This project came about because of my fascination with a singular set of data made available by the Tyler Police Department:
This dataset is updated every two minutes and lists, with important exceptions, all the incident reports that come in to the police. Censored from the list are certain sensitive crimes, such as Sexual Assault and Suicide. Violent crimes are delayed up to fifteen minutes so police can secure the scene. There is a FAQ that describes all the limitations of the data.