mapping the earthmarysikes.weebly.com/uploads/6/0/5/0/60508559/2_latitude_longitude_maps.pdf · •...
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![Page 1: MAPPING THE EARTHmarysikes.weebly.com/uploads/6/0/5/0/60508559/2_latitude_longitude_maps.pdf · • Longitude shown by meridians • Meridians converge at the poles and are NOT parallel](https://reader030.vdocuments.site/reader030/viewer/2022041019/5ecea05faec6d51be948d23c/html5/thumbnails/1.jpg)
MAPPING THE EARTH
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Maps
• A map is a two-dimensional representation of the earth.
• Maps incorporate projections and data for accuracy.
• All maps distort the earth to some extent.
• GPS has given us a much more accurate view of the surface of Earth
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Most common projection is the Mercator projection - It became the standard map projection for nautical purposes because of its ability to represent lines of constant course.
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Latitude & Longitude
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Latitude & Longitude
0º
0º
Point of Origin
Prime Meridian
Equator
(Longitude)
(Latitude)
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Latitude & Longitude
0º, 0º
Prime Meridian
Equator
10º 20º W 30º 10º 20º 30º E 10º
20º
30º
10º
20º
30º
S
N
+
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Latitude
• Latitude shown by parallels (run parallel to equator)
• Show distance north/south of equator
• The equator is 0º latitude, and the north and southpoles are at 90º angles from the equator.
• The linear distance between parallel lines never changes, regardless of their position on earth. That distance is approximately 69 miles per degree anywhere on earth.
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Parallels of Latitude
10º
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Parallels of Latitude
10º
10º
10º
690 miles
690 miles
690 miles
10º S
0º N
10º N
20º N
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Longitude • Longitude shown by meridians
• Meridians converge at the poles and are NOT parallel to each other
• The prime meridian is designated 0º and extends from the north pole to the south pole through Greenwich, England.
• The linear distance between one degree of longitude at the equator is approximately 70 statute miles.
• The linear distance between one degree of longitude at the Arctic and Antarctic Circles is
about 26 statute miles.
• One degree of longitude is equal to 60 minutes
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Meridians of Longitude
10º
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Meridians of Longitude
10º
10º
110º W 120º W
690 miles
460 miles
240 mi
10º
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Determining Latitude & Longitude
30º N
50º W
Equator (0º)
Prime Meridian
(0º) 30ºN, 50ºW
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TIME ZONES
http://www.bbc.co.uk/news/world-12849630
http://www.wisconline.com/objects/ViewObject.aspx?ID=SOC3702