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What is a Dot Density Map?
- Any symbol can be used
- Advantage-illistrates spatial density
- Disadvantage-misperception of density
- -inability to recover original data
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What is a Dot Density Map?
- Dot=1 Unit
- Easiest to understand
- No legend
- Cartographer has percise control
- Dot=2 or more units
- more common
- requires careful approach
- points for polygons
- Enumeration unit
- Smallest statistical area should be choosen
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What is a Flow Map?
- Represents movement
- Quantitative (Amount)
- Qualitative (Type)
- Routes a line should follow the actually route taken
- Human or cultural
- Map Organization
- Figure/Ground-Flow lines should be figures
- Lines shouldnt obscure base map
- Place center of flow carefully
- Line Scaling
- -Usually proportionally scaled lines
- -Watch size of arrow and branches
- Legend
- -Should be clear
- -Lines may be labeled
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What is a Cartogram?
- Very unique appearance
- Size of state can be picked by a factor
- Area of boundrie is porportional to data they represent
- Raw data, Ratio data, no classification or symbolization
- Types
- Continguous Cartogram-no missing/blank area, shape more familiar
- Non Contingous Cartogram-moved apart, true to shape
- Purpose
- need to recognize mapped feature
- preserve shape orientation contiguity
- Dramatic data needed
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