Measuring Earth: Topographic Maps

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Presentation transcript:

Measuring Earth: Topographic Maps Notes: Pages 3 - 9 ©Mark Place, 2008-2009 www.LearnEarthScience.com

What is the purpose?

Who uses topographic maps? the military miners police farmers

When might someone use a topographic map? building homes plan a hiking trip landscaping road building

Contour Interval? 25

Contour Interval? 20 Elevation of "A"? 540 Elevation of "B"? 580

619

What do hachured lines show? areas of depression

concerning hachured lines? What are the rules concerning hachured lines? first hachured line has same elevation as previous contour line

top of the page, what direction If north is at the top of the page, what direction is this river flowing? south

Can a river flow north? yes!

Name two ways that you can determine which way a river flows on a topographic map. contour lines point upstream rivers flow downhill

What are the steps to draw a topographic profile place a piece of paper between the points mark where every contour line touches the edge of the paper determine the elevation of each mark place the paper on the graph and mark the elevation of each contour line

Using the map and chart below, construct a topographic map profile.

Please match the contour map on the left with the profile on the right.

Topographic Maps---Distance Between Points What is the distance, in kilometers, from Kingston to Oswego? 266 km What is the distance, in miles, from Plattsburgh to Jamestown? 342 miles

gradient = change in elevation distance The elevation of Albany is 282 feet. The elevation at Binghamton is 1634 feet. What is the gradient in feet/mile? Show all work. gradient = change in elevation distance = 1634-282 115 miles = 1352 ft 115 miles = 11.8 ft/mile

gradient = change in elevation distance The elevation of Watertown is 99m. The elevation at Oswego is 144m. What is the gradient in m/km? Show all work. gradient = change in elevation distance = 144 - 99 75 km = 45 m 75 km = 0.6 m/km

gradient = change in temperature distance If the distance between the two circled cities is 425 km, what is the temperature gradient? Show all work. gradient = change in temperature distance = 82-48 425 = 34 425 = 0.08 °F/km