Class 1b: Introduction to maps - PowerPoint PPT Presentation

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Class 1b: Introduction to maps

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Introduction to maps. What is a map? ... How do we read maps? Map scale. Ratio of the distance on the map to the distance on the ground ... – PowerPoint PPT presentation

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Title: Class 1b: Introduction to maps


1
Class 1b Introduction to maps
2
What is a map?
  • A two-dimensional representation of the spatial
    distribution of selected phenomena

3
Why make maps?
4
Latitude and longitude
  • Latitude how far north or south

5
Latitude and longitude
  • Longitude how far east or west

6
How do we read maps?
7
Map scale
  • Ratio of the distance on the map to the distance
    on the ground

8
Map scale
  • Graphic

9
Map scale
  • Verbal
  • 1 inch equals 10 miles

10
Map scale
  • Representative fraction or ratio
  • 124,000

11
Map symbolization
12
Point symbols
  • Every symbol counts as one occurrence

13
Line symbols
  • One-dimensional

14
Area symbols
  • Each territory or region has one value

15
Topographic maps
16
Topographic maps
17
Topographic maps
18
Map projections
  • Project a round globe onto a flat surface

19
Map projections
  • Three properties to consider

20
Cylindrical projections
  • Shapes are preserved, but not area

21
Conic projections
22
Planar projections
23
Other projections
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