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Title:

Maps and Mapping

Description:

Types of maps. Data types and measurement. Symbolization. Classification. Map scale. Map layout. Maps ... Maps. Thematic Maps. Thematic Maps. Map Elements ... – PowerPoint PPT presentation

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Tags: map | mapping | maps

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Title: Maps and Mapping


1
Maps and Mapping
  • Never have so many poor maps
  • been made so quickly
  • Types of maps
  • Data types and measurement
  • Symbolization
  • Classification
  • Map scale
  • Map layout

2
Maps
  • A representation of the earth surface on a flat
    medium at certain scale
  • A model of spatial patterns of features
  • Selective
  • Classified
  • Generalized point, line, areas
  • Graphically customized

3
Types of Maps
  • General purpose maps
  • Where?
  • Topography
  • Thematic maps
  • What
  • A theme

4
General Purpose Maps
5
Thematic Maps
6
Thematic Maps
7
Map Elements
  • A Map
  • Title what, where, when
  • Scale
  • Orientation
  • Legend
  • Others

8
Symbolization
  • Symbols
  • Point
  • Lines
  • Areas

9
Symbolization
  • Qualitative difference
  • Different things
  • Landuse, residential, commential
  • Highways, Railways
  • Quantitative difference
  • Essentially same thing, but different in degree
  • Population density
  • Temperature
  • Crime rate
  • Population

10
Qualitative Differences
  • Different shapes
  • Different patterns
  • Different colors

11
Quantitative Difference
  • Size of symbol
  • Value of color

12
Symbolization
Qualitative Quantitative Shape
Color (Hue) Pattern Size
Value
Points Lines Areas
13
Choropleth Map
14
Area Map
15
Isopleth Map
16
Bad Choice of Colors
17
Map Scale
  • Representation
  • Representation fraction (RF) 12,500
  • Graphic scale
  • Verbal scale one cm on the map represents 25
    meters on the ground

18
Large scale vs. small scale
19
Orientation North Arrow
  • North arrow appropriate

20
Orientation
  • North arrow not appropriate

21
Grid
22
Classification
  • Equal Interval
  • The range of possible values is divided into
    equal-sized intervals
  • Natural breaks
  • Finding the biggest gap
  • Quartiles
  • Same number of observations in a class
  • Standard deviations
  • Mean and standard deviation
  • Equal area

23
Natural Break
Percentages of Asian Pacific Islanders, 1999
24
Equal Interval
25
Quantile
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