Section 4: Topographic Maps

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Presentation transcript:

Section 4: Topographic Maps Topographic Map: a map showing the surface features of an area. https://www.youtube.com/watch?v=K-UXrpAjyl0 https://www.youtube.com/watch?v=CE1B7tdGCw0

Topographic Maps Two dimensional model of the Earth’s surface Topographic maps are also known as contour maps. Show elevation above sea level using contour lines.

“Real World” Contour Map

Topographic Maps Contour Line – - line on a map that connects points of EQUAL elevation. - show elevation and shape of the land Relief – Difference between high and low elevations

Topographic Maps Contour Interval – difference in elevation between each line. MUST be equal spacing. Contour interval = 20 feet 580 560 540 520

Topographic Maps Index Contour – Usually every 5th line is printed darker and has an elevation printed on it.

Closely Spaced Contours Steeper Slope (Gradient) – contour lines are closer together.

Wide Spaced Contours Gradual/Gentle Slope (Gradient) – contour lines are farther apart.

What are the dark contour lines on a topographic map? What do the numbers on the dark contour lines indicate? How do you determine the contour interval on a topographic map? Pg. 27

Uses of Topographical Maps Who would need to know the elevation, relief, or slope of a portion of Earth’s surface? In which type of are would you build a ski resort? Where would you build a shopping mall? Pg 30