using a topographic map. a relief map with contour lines
TRANSCRIPT
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Using A Topographic Map
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A Relief Map With Contour Lines
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A
TOPOGRAPH
I
C
MAP
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What are they?• Topographic maps are an invaluable tool for
everyone from hikers and campers to county planners and emergency response teams.
• These maps are used by planners, engineers, outdoor enthusiasts, and many others rely on these to accurately depict the land surface.
• During natural disasters, such a hurricanes, floods, landslides, and earthquakes large numbers of topographic maps are used by emergency response agencies and to assist recovery.
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Map Scales• A ratio of distance on a map to the actual
distance on earth– Ex. 1:24,000 means that one unit of
measurement on the map will equal 24,000 of those units on earth
– May also be represented graphically:
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U.S.G.S. Maps• The United States Geological Survey
produces topographic maps of the entire country
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These maps are called quadrangles and they come in different sizes
1:250,000
1:100,000
1:24,000
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As we look at a smaller area of the earth, we can put more details on the map so a 7.5’ quadrangle will be more detailed.
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• Most USGS map series divide the United States into quadrangles bounded by two lines of latitude and two lines of longitude. For example, a 7.5-minute map shows an area that spans 7.5 minutes of latitude and 7.5 minutes of longitude
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New York 10 of Latitude by 20 of Longitude
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Long Island 7.5’ by 7.5’
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Map Symbols
Are universal so that everyone everywhere can read the map without a
individual legend
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Vegetation is green
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Water is blue
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Each road type has it’s own symbol
Secondary Road
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Ice
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Rail Road
Orc
hard
Use the Map Symbol Key in your text book to see all the acceptable colors and symbols
School