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Published byChad Hoover Modified over 9 years ago
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Thematic Mapping Tom E Sellsted City of Yakima, Washington Tsellste@ci.yakima.wa.us SafetyNet Conference
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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.
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Burglaries Basic Pin Mapping Can select by Date and/or Time Range Could be for a specific area of interest
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Sex Offenders Use of color to designate level Use of marker size to designate severity of level
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Events Near a Location/Person Proximity to a defined address or person Types of Events
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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
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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
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Hot Spot Mapping Surface Density or Raster Repeating call locations Proximity to other events
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Stolen/Recovered Vehicles Defined Date/Time Range Color for Stolen or Recovered Draw link between associated cases Look for trends
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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
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Street Capacity Analysis Displaying Multiple Themes Correlation between Themes Trying to not Over Visualize…
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Intersection Analysis Have Multiple Meanings at a point Can take time to digest…
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Pedestrian Accidents Different Marker Symbols
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Severity of Injuries Marker Size Marker Color Color Coded Descriptive Table
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Total Collisions Marker Size Labeling Markers Descriptive Summary Table
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Contributing Factors Stacking Markers Using Sizes and Marker Styles
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Type of Collisions Use Pie charts Size indicates Number Slices indicate Frequency of Type
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