thematic mapping tom e sellsted city of yakima, washington [email protected] safetynet...
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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
