PSC 121 Prince George's Community College

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PSC 121 Prince George's Community College

PSC 121 Prince George's Community College

Topographic maps A topographic map shows the shape of the Earth’s surface by using contour lines.

Creating the contour map Imagine slicing through a mountain with a perfectly flat, horizontal piece of glass. The intersection of the mountain with the glass is a line of constant elevation and becomes a contour line. Creating the contour map

PSC 121 Prince George's Community College Map Scale There are also scales that can be used to determine distance for many different units using a ruler and the map scale. 1 mile 1 mile 1/2 mile 2000 feet 1 kilometer 200 feet PSC 121 Prince George's Community College

PSC 121 Prince George's Community College Steep or flat? Elevation change 2170-2150 = 20 feet Gradient 20ft/0.5 mi = 40 ft/mi Flat Elevation change 1380-780 = 600 feet Gradient 600ft/0.5 mi = 1200 ft/mi Steep 0.5 mile distance PSC 121 Prince George's Community College

Tracking Flowing Water You can look at the contour lines as they cross the stream. They will always point upstream. Downstream Upstream PSC 121 Prince George's Community College