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What is a Topographic Map?
Earth's surface shape shown by contour linesContour lines - lines connecting points of equal elevationmeasure mountain height, ocean depths, slope steepnessAllows planning for –
parkshiking/ridingbuilding/constructiondrainage
Reading Topographic Maps
Contours – lines of different widths
Contours never cross
Used to determine elevations – index contours are wider
Elevations printed along index contours
Narrower contours found between index contours – help show more details of land surface
Contours close together = steep slopes
Widely spaced contours = fairly level/flat ground slope relatively level
contour interval = elevation difference between adjacent contour lines
Reading Topographic Maps (continued)
Index Contour (Elevation = 100’)Index Contour (Elevation = 200’)
Every 5 lines: (200-100)/5 = 20’
Therefore, contour interval = 20’
What Does It All Mean?The more contour lines packed closely together represent steep, cliff-like areas
What Does It All Mean?Contour lines that form a mountain-like shape show where water has cut a path (valley)
• What is the contour interval?
• What is the elevation of Mt. Rainer?
• Describe the circled area.
• Describe this circled area.
14,000
13,800
14,000 – 13,800 = 200200 / 5 lines = 40’
X
What is the average elevations for houses 3, 4, and 5 to the nearest tenth of a meter?
Contour Interval
= 3 m
Contour Interval
= 3 m
112
.
9 7 3
82
..
....
Remember…Topographic maps can help you find elevations, Trails, and Places to climb
Topographic maps show you the “lay of the land” (landforms) by connecting points of equal elevation
Index contour lines are darker and have an elevation associated with it
The ‘Contour Interval’ is the elevation distance between two adjacent lines
Scales are usually shown in inches or feet
Mt. Capulin Capulin Volcano National Monument, located in northeastern New Mexico, was designated a U.S. National Monument on August 9, 1916.
It is a well-preserved, relatively young (58,000 to 62,000 years old), symmetrical cinder cone. It rises steeply from the surrounding grassland plains to an elevation of 8,182 feet above sea level. The irregular rim of the crater is about a mile in circumference and the crater about 400 feet deep.