map creation using arcview: practical issues tom largo bureau of epidemiology november 13, 2006
TRANSCRIPT
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MAP CREATION USING ARCVIEW:PRACTICAL ISSUES
Tom LargoBureau of Epidemiology
November 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)