Second quiz cartography Flashcards
1
Q
Types of thematic maps
A
Dot density
Choropleth
Isarithmic
Flow
Cartogram
Proprotional symbol
2
Q
When to use Choropleth maps
A
-Regional patterns
- One variable
- Enumeration units
- The big picture
- Relative data (ratios,proportions,etc)
3
Q
Pros of Choropleth maps
A
- Good for geographic areas
- Easy to identify patterns
- Easy to create
- Works with all data measurement scales (nominal, ordinal, interval, ratio)
4
Q
Cons of Choropleth maps
A
- Not great at showing population relative to geographic space
- easy to misinterpret
- Color selection can be challenging
- Class breaks can change story quickly
- Data has to be standardized/normalized
5
Q
When to use Dot Density maps
A
- no enumeration units
- one or two variables
- cant use color
- absolute data
6
Q
Pros of Dot Density maps
A
- Easy to create
- Shows concentrations over space
- Ratio level data
- Can use more than one variable
7
Q
Cons of Dot Density maps
A
- must be drawn on equal area map projection
- hard to retrieve rates/numbers from map
- Reader might infer dot locations as absolute locations
8
Q
When to use Proportional Symbol maps
A
- Data is attached to geographic points or areas
- More than one variable
- Want to show difference of size or magnitude
- What to show absolute or relative data
9
Q
Pros of Proportional Symbol Maps
A
- Easy to make
- Can show ordinal or ratio data
- Easy for reader to conceptualize
- Enumeration unit size doesnt matter
- Can use discrete categories/ range grading
10
Q
Cons of proportional Symbols maps
A
- Symbol overload/congestion
- Readers do not estimate the symbol area well
- Tend to require manual maneuvering of symbols because of overload issues
- Large variation in values and data locations is problematic
11
Q
When to use Isarithmic Maps
A
- Data is continuous
- Data needs to be visualized on a surface
- Need to connect same values to each other
- Large geographic area
- Control points arent tied to political boundaries
- Want to map natural phenomena
12
Q
Pros of Isarithmic maps
A
- Good for mapping real or conceptual surface level data
- Total form of distribution is displayed
- Adaptable to different kinds of generalization
- Precision is easily changed
- Relative or absolute data
13
Q
Cons of Isarithmic maps
A
- Values between control points are a guess
- Level of precision determines how readable a map is
- Interval units may be hard for reader to conceptualize
- Can involve a stats understanding of data
14
Q
When to use Cartogram
A
- Want to leave an impression
- Want an alternative to a choropleth map
- Data has strong and unexpected size disparities between locations
15
Q
Pros of Cartogram maps
A
- Unique
- Multiple types
- Basemap performs the funcion of geography AND attribute
- An increase in popularity with technology advancements
