MAP CREATION USING ARCVIEW: PRACTICAL ISSUES

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MAP CREATION USING ARCVIEWPRACTICAL ISSUES

• Tom LargoBureau of EpidemiologyNovember 13,
  2006

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TOPICS TO COVER

• Optimal shades to select for B W printed MDCH
  documents
• Determination of appropriate classification type
• Equal Interval
• Quantile
• Natural Breaks
• Standard Deviation

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SHADING

• Max number of discernible groups 4
• white
• black
• two shades of grey
• To determine optimal shading, had to work
  backwards viewing copy of PDF

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SPECIFICATIONS

• In ArcView 3, the specifications for the two grey
  shadings were

Hue Saturation Value Result
0 0 225
0 0 150
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SPECIFICATIONS

• In ArcView 9, the specifications are

Value Result
82
58
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EXAMPLE
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EXAMPLE
Problem!
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EXAMPLE
One solution
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ONE LAST SUGGESTION

• See proof of final from printer to ensure can
  distinguish grey shades

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SELECTING A CLASSIFICATION TYPE

• Each type will usually result in a different
  illustration
• Impact on viewer will be different depending on
  type selected
• Q How do you determine which one to use?

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EQUAL INTERVAL(equal rate range)
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QUANTILE(equal number of counties in each
category)
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NATURAL BREAKS(id natural breakpoints in data
distribution)
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STANDARD DEVIATION(ranges based on std dev
around mean rate)