Chicago Police Gun Related Incident Visualizations 2008 – 2016

A look into Chicago Police Department’s gun related incident reports from January 2008 through February 2016. The data is from data.cityofchicago.org.

Stacked bar chart of monthly incidents by primary type.
Click chart image to expand
Chicago Police Department Monthly Gun Related Incident Reports
Line chart of monthly incidents by primary type.
Click chart image to expand
Chicago Police Department Monthly Gun Related Incident Reports Line Chart

Static Map
Chicago Police Department Gun Related Incident Reports Jan 2008 - Feb 2016 Heat Map

chicago-homicideschicago-race-map

Animated Map


C# Console Application used to create the JSON for the Stacked Bar Chart and Line Chart.

int counter = 0;
string line;
bool header = true;
List primaryCrimeType = new List();
Dictionary<string, Dictionary<string, int>> dictDate_PriCount = new Dictionary<string, Dictionary<string, int>>();
System.IO.StreamReader file =
    new System.IO.StreamReader("C:\\CHICAGOGUN\\2008-present  GUN RELATED CHICAGO CRIME INCIDENTREPORTS.csv");
while ((line = file.ReadLine()) != null)
{
    counter++;
    if (header)
        header = false;
    else
    {
        string[] parts = line.Split(',');
        DateTime date = DateTime.Parse(parts[0]);
        string datekey = date.ToString("MMM yy");
        string primary = parts[1].Trim();
        if ( dictDate_PriCount.ContainsKey(datekey) )
        {
            Dictionary<string, int> dictExistingInner = new Dictionary<string, int>();
            dictExistingInner = dictDate_PriCount[datekey];
            int existing_count = dictExistingInner[primary];
            existing_count += 1;
            dictExistingInner[primary] = existing_count;
            dictDate_PriCount[datekey] = dictExistingInner;
        }
        else
        {
            Dictionary<string, int> dictFreshInner = new Dictionary<string, int>();
            dictFreshInner.Add("BATTERY", 0);
            dictFreshInner.Add("WEAPONS VIOLATION", 0);
            dictFreshInner.Add("ASSAULT", 0);
            dictFreshInner.Add("ROBBERY", 0);
            dictFreshInner.Add("CRIM SEXUAL ASSAULT", 0);
            dictFreshInner.Add("OTHER OFFENSE", 0);
            dictFreshInner.Add("NON-CRIMINAL", 0);
            dictFreshInner[primary] = 1;
            dictDate_PriCount.Add(datekey, dictFreshInner);
        }
    }
}
file.Close();
string json = "";
foreach (string keydate in dictDate_PriCount.Keys)
{
    json += "['" + keydate + "' ";
    foreach( string pri in dictDate_PriCount[keydate].Keys)
    {
        json += "," + dictDate_PriCount[keydate][pri];
    }
    json += "],\r\n";
}
StreamWriter streamWrite;
streamWrite = File.AppendText("C:\\Airplanes\\2008-2016ChicagoGunJSON.txt");
streamWrite.WriteLine(json);
streamWrite.Close();

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