Thematic Mapping Tom E Sellsted City of Yakima, Washington SafetyNet Conference

What is Thematic Mapping? A thematic map enables statistics to speak through visual representation of the facts and further enables their geographic interpretation.

Burglaries  Basic Pin Mapping  Can select by Date and/or Time Range  Could be for a specific area of interest

Sex Offenders  Use of color to designate level  Use of marker size to designate severity of level

Events Near a Location/Person  Proximity to a defined address or person  Types of Events

Density Mapping  Defined areas – can be large or small  Shading by the occurrence of a selected type of event  Darker indicates a higher concentration of events  Lighter shade indicates a lower concentration of events

Repeat Calls  Locations of 10 or more  Size indicates the number of repeat calls  Color could also be used  Could show just top Repeat Call locations

Hot Spot Mapping  Surface Density or Raster  Repeating call locations  Proximity to other events

Stolen/Recovered Vehicles  Defined Date/Time Range  Color for Stolen or Recovered  Draw link between associated cases  Look for trends

Time Series Animation  Ability to look for trends based on time  Date/Time Range  Can do Individual or Cumulative range study  Time range can be: hour, day, month or year

Street Capacity Analysis  Displaying Multiple Themes  Correlation between Themes  Trying to not Over Visualize…

Intersection Analysis  Have Multiple Meanings at a point  Can take time to digest…

Pedestrian Accidents  Different Marker Symbols

Severity of Injuries  Marker Size  Marker Color  Color Coded Descriptive Table

Total Collisions  Marker Size  Labeling Markers  Descriptive Summary Table

Contributing Factors  Stacking Markers  Using Sizes and Marker Styles

Type of Collisions  Use Pie charts  Size indicates Number  Slices indicate Frequency of Type