Chapter 15: Mapping Methods

Question 1

Mapping Methods (3)

Answer 1

1. dot
2. proportional symbol
3. choroplethic

Question 2

Dot Mapping Method

Answer 2

• repeated uniform point symbols to represent the attribute values
• dot = 1 or dot > 1
• when dot > 1, it’s positioned at at the center of gravity of the objects
• best used for distributions with a distinct internal arrangement

Question 3

Counting Up Method

Answer 3

• used in the Dot Mapping Method
• assigning a dot value and then dividing this into the number of enumeration units then adding the remainder to the next population

Question 4

Dot Method Advantages

Answer 4

• easy to understand
• good for discrete distributions
• original data can be recovered from a well designed map
• more than one distribution can be showed

Question 5

Dot Method Disadvantages

Answer 5

• map interpretation not one-to-one
• time consuming if done by hand

Question 6

Proportional Symbol Mapping Method

Answer 6

• graduated/variable point symbol maps
• symbol size varies in proportion to the quantity it represents
  uses area to represent the data magnitude

Question 7

Square Root Method (Circle Symbol Scaling)

Answer 7

the area of each circle is directly proportional to the actual value it represents

Question 8

Psychological Scaling Method

Answer 8

alters the area of the shapes to compensate for the viewer’s underestimation of area

Question 9

Choroplethic Method

Answer 9

• represents enumeration data on a polygonal basis
• the most common way to map aggregated data
• uses a distinctive color or shading to areas other than those bounded by isolines