Lab 6 notes

Lab 6 notes - Topographic Maps and Aerial Photographs...

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Topographic Maps and Aerial Photographs
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Topographic Maps • Objectives: • Locate features on topographic maps • Understand and convert map scales • Understand topographic map construction • Interpret landscapes using topographic maps • Construct topographic profiles from topographic maps
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Topographic Maps • A topographic map is a miniature model of the Earth’s 3D surface printed on 2D paper. • They reveal the lay of the land (hills, gullies etc.) by using contour lines. • This is primarily how they differ from planimetric maps such as road maps.
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Contour Lines Contour lines convey information about the third dimension (elevation). • Contour lines connect points of equal elevation. Contour interval (CI) is the elevation increment between adjacent contour lines.
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Contour lines connect points of equal elevation.
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When do contour lines repeat?
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When do contour lines repeat?
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Index Contours and Benchmarks • Every fifth contour line is darker and labeled with an elevation. These are called index contours . See figure 9.7 • Elevations of specific points are indicated by the notation BM, which means Benchmark (see Fig. 9.7).
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Relief and Gradient Relief is the elevation difference between specific points. Regional relief
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Lab 6 notes - Topographic Maps and Aerial Photographs...

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