Understanding the Crime Map

When View Crime Map is clicked, a map of the city is drawn showing crime locations for the past month. The map is likely to be more useful, however, if you focus on a particular area of interest. The "Where" options in the Selected Crimes tab (upper left corner) enable a specific location (such as an address or intersection) or a specific place (such as a neighborhood, apartment complex or large commercial development) to be selected - simply start typing and then choose from the list of suggested matches. You can also adjust the radius of the area around the selected location. Choosing a specific location causes the map to zoom into that area and highlight only crimes within that boundary.

You may also want to adjust the time period for the crimes that are highlighted. Using the calendar controls in the "When" section, you can choose a date range that can vary from a minimum of a month to a maximum of a year. Changing the date range will cause the map and charts to update automatically.

Since crime patterns are often influenced by how land is developed, the background colors on the map reflect the current land use (click the Legend tab for more information). The boundary of the area you have selected is shown with a gray line. The small gray dots are all crimes for the past year. The crimes you select are shown with a gray diamond.

There are two charts to help interpret the pattern of crimes given the area and timeframe you have selected. The pie chart shows the distribution of crime by category. Moving the mouse cursor over a particular "slice" of the pie will highlight the location of crimes in that category (note: one location may represent multiple crimes and that sex crimes are not mapped). A given type of crime often will have a pattern that reflects the underlying land use or street pattern. Below the map is a bar chart that shows the trend over the past two years for crimes in the selected area. The most recent 12 months are shown with green bars and the 12 months previous are shown with yellow bars. This chart can show seasonal variations, month over month comparisons, and long term trends.