Maps What are they? What do they tell us? What is map scale (large & small)? What is map projection?...
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Transcript of Maps What are they? What do they tell us? What is map scale (large & small)? What is map projection?...
![Page 1: Maps What are they? What do they tell us? What is map scale (large & small)? What is map projection? How does it impact the impression(s) the maps give.](https://reader035.fdocuments.us/reader035/viewer/2022062804/5697bf7a1a28abf838c8313a/html5/thumbnails/1.jpg)
Maps• What are they?
• What do they tell us?
• What is map scale (large & small)?
• What is map projection? How does it impact the impression(s) the maps give the reader?
![Page 2: Maps What are they? What do they tell us? What is map scale (large & small)? What is map projection? How does it impact the impression(s) the maps give.](https://reader035.fdocuments.us/reader035/viewer/2022062804/5697bf7a1a28abf838c8313a/html5/thumbnails/2.jpg)
What Are Maps?
• Maps are two-dimensional representations of all or part of the earth’s surface.
• The are scale models of the earth’s surface that have been simplified to make them readable.
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Maps
• Two purposes– As reference tools
• To find locations, to find one’s way
– As communications tools• To show the distribution of human and physical
features
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Map Scale
• Map scale shows ratio of the distance on the map to that on the earth’s surface.
• It gives the reader of the map a sense of how much of the earth’s surface is portrayed on the map and also helps determine distances between places on the map.
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Maps: Scale
• Types of map scale– Ratio or fraction: 1:24,000 (1 inch on the map = 24,000
inches on the earth’s surface, 1 meter on the map = 24,000 meters on the earth’s surface)
– Written: 1 inch = 1 mile (1 inch on the map = 1 mile on the earth’s surface)
– Graphic:
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Large v Small Scale Maps
• The larger the scale of the map, the smaller the portion of the earth’s surface it shows
• The smaller the scale of the map, the larger the portion of the earth’s surface it shows
Examples:
A Washington State map is at a scale of 1:10,000,000
A map of downtown Seattle is at a scale of 1: 10,000
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Smaller Scale
Larger Scale
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![Page 12: Maps What are they? What do they tell us? What is map scale (large & small)? What is map projection? How does it impact the impression(s) the maps give.](https://reader035.fdocuments.us/reader035/viewer/2022062804/5697bf7a1a28abf838c8313a/html5/thumbnails/12.jpg)
Projection
• Map projection is the way in which a portion of the earth’s surface is transferred to a map.
• The problem is that the earth is basically spherical while maps are flat, thus there is going to be some sort of distortion on the map.
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Issues with map projections
To some extent all maps have issues with the following:
• size
• shape
• distance
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Mercator
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Robinson