# 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
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